diff --git a/8-async/02-promise-basics/02-delay-promise/solution.md b/8-async/02-promise-basics/02-delay-promise/solution.md new file mode 100644 index 00000000..85e8baa4 --- /dev/null +++ b/8-async/02-promise-basics/02-delay-promise/solution.md @@ -0,0 +1,9 @@ +```js run +function delay(ms) { + return new Promise(resolve => setTimeout(resolve, ms)); +} + +delay(3000).then(() => alert('runs after 3 seconds')); +``` + +Please note that in this task `resolve` is called without arguments. We don't return any value from `delay`, just ensure the delay. diff --git a/8-async/02-promise-basics/02-delay-promise/task.md b/8-async/02-promise-basics/02-delay-promise/task.md new file mode 100644 index 00000000..0d74cf45 --- /dev/null +++ b/8-async/02-promise-basics/02-delay-promise/task.md @@ -0,0 +1,14 @@ + +# Delay with a promise + +The built-in function `setTimeout` uses callbacks. Create a promise-based alternative. + +The function `delay(ms)` should return a promise. That promise should resolve after `ms` milliseconds, so that we can add `.then` to it, like this: + +```js +function delay(ms) { + // your code +} + +delay(3000).then(() => alert('runs after 3 seconds')); +``` diff --git a/8-async/02-promise-basics/03-animate-circle-promise/solution.md b/8-async/02-promise-basics/03-animate-circle-promise/solution.md new file mode 100644 index 00000000..e69de29b diff --git a/8-async/02-promise-basics/03-animate-circle-promise/solution.view/index.html b/8-async/02-promise-basics/03-animate-circle-promise/solution.view/index.html new file mode 100644 index 00000000..3229daf8 --- /dev/null +++ b/8-async/02-promise-basics/03-animate-circle-promise/solution.view/index.html @@ -0,0 +1,61 @@ + + + + + + + + + + + + + + + + + diff --git a/8-async/02-promise-basics/03-animate-circle-promise/task.md b/8-async/02-promise-basics/03-animate-circle-promise/task.md new file mode 100644 index 00000000..7860a71d --- /dev/null +++ b/8-async/02-promise-basics/03-animate-circle-promise/task.md @@ -0,0 +1,15 @@ + +# Animated circle with promise + +Rewrite the `showCircle` function in the solution of the task so that it returns a promise instead of accepting a callback. + +The new usage: + +```js +showCircle(150, 150, 100).then(div => { + div.classList.add('message-ball'); + div.append("Hello, world!"); +}); +``` + +Take the solution of the task as the base. diff --git a/8-async/03-promise-chaining/1.html b/8-async/03-promise-chaining/1.html new file mode 100644 index 00000000..c966fc90 --- /dev/null +++ b/8-async/03-promise-chaining/1.html @@ -0,0 +1,16767 @@ + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. 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Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. 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Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. 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Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. 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Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. 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Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + + + + + + Cross Platform + + + + + Develop code that runs on OS X and other platforms. Apple provides tools and programming interfaces that help you move code to OS X from other platforms. Likewise, tools and programming interfaces help you develop code on OS X that you can deploy on other systems. + diff --git a/8-async/03-promise-chaining/article.md b/8-async/03-promise-chaining/article.md index c5debaa5..da658069 100644 --- a/8-async/03-promise-chaining/article.md +++ b/8-async/03-promise-chaining/article.md @@ -116,6 +116,31 @@ Here each `.then` returns `new Promise(…)`. JavaScript awaits for it to settle So the output is again 1 -> 2 > 4, but with 1 second delay between `alert` calls. +````smart header="Thenables" +To be precise, any object that has a method `.then` is treated as a promise here. So that we could use a custom "promise-compatible" object in the chain. Such objects are called "thenable". + +Here's an example: + +```js run +let thenable = { + then(resolve, reject) { + setTimeout(() => resolve(result * 2), 1000); + } +}; + +new Promise(resolve => resolve(1)) + .then(result => { + return thenable; + }) + .then(alert); // shows 2 after 1000ms +``` +In practice we rarely need thenables, because if we want to make our own promise-compatible objects, then we can inherit from the native `Promise` class. + +But that's still good, because gives us additional flexibility. We don't *have* to inherit from `Promise`. In particular, that allows to use a custom implementations of promises coming from 3rd-party libraries along with native promises. +```` + +## Example: loadScript + Let's use it with `loadScript` to load scripts one by one, in sequence: ```js run @@ -127,41 +152,27 @@ loadScript("/article/promise-chaining/one.js") return loadScript("/article/promise-chaining/three.js"); }) .then(function(script) { - // use variables declared in scripts + // use functions declared in scripts // to show that they indeed loaded - alert("Done: " + (one + two + three)); + one(); + two(); + three(); }); ``` +Here each `loadScript` call returns a promise, and the next `.then` awaits until it resolves. So scripts are loaded one after another. -We can add more asynchronous actions to the chain, and the code is still "flat", no "pyramid of doom". +We can add more asynchronous actions to the chain, and the code is still "flat", no signs of "pyramid of doom". ## Error handling -In case of an error, the closest `onRejected` handler down the chain is called. +Asynchronous actions do not always succeed. For instance, `loadScript` fails if there's no such script. -Let's recall that a rejection (error) handler may be assigned with two syntaxes: +Luckily, chaining is great for handling errors. When a promise rejects, the control jumps to the closest rejection handler down the chain. -- `.then(...,onRejected)`, as a second argument of `.then`. -- `.catch(onRejected)`, a shorthand for `.then(null, onRejected)`. - -In the example below we use the second syntax to catch all errors in the script load chain: +In the example below we append `.catch` to handle all errors in the scripts loading chain: ```js run -function loadScript(src) { - return new Promise(function(resolve, reject) { - let script = document.createElement('script'); - script.src = src; - - script.onload = () => resolve(script); -*!* - script.onerror = () => reject(new Error("Script load error: " + src)); // (*) -*/!* - - document.head.append(script); - }); -} - *!* loadScript("/article/promise-chaining/ERROR.js") */!* @@ -172,20 +183,18 @@ loadScript("/article/promise-chaining/ERROR.js") return loadScript("/article/promise-chaining/three.js"); }) .then(function(script) { - // use variables declared in scripts - // to show that they indeed loaded - alert("Done: " + (one + two + three)); + alert('done!'); }) *!* - .catch(function(error) { // (**) + .catch(function(error) { // (*) alert(error.message); }); */!* ``` -In the code above the first `loadScript` call fails, because `ERROR.js` doesn't exist. The initial error is generated in the line `(*)`, then the first error handler in the chain is called, that is `(**)`. +In the code above the first `loadScript` call fails, because `ERROR.js` doesn't exist. The control jumps to the closest error handler `(*)`. -Now the same thing, but the error occurs in the second script: +The same error handler is called if an error occurs in the second script: ```js run @@ -199,9 +208,7 @@ loadScript("/article/promise-chaining/one.js") return loadScript("/article/promise-chaining/three.js"); }) .then(function(script) { - // use variables declared in scripts - // to show that they indeed loaded - alert("Done: " + (one + two + three)); + alert('done!'); }) *!* .catch(function(error) { @@ -210,12 +217,14 @@ loadScript("/article/promise-chaining/one.js") */!* ``` -Once again, the `.catch` handles it. +The `.catch` works like in a `try..catch` block. We may have as many `.then` as we want, and then use a single `.catch` at the end to handle errors in all of them. -### Implicit try..catch +## Implicit try..catch -Throwing an exception is considered a rejection. +Promises automatically take care about errors thrown inside them. + +That's like an executor and handlers have invisible `try..catch` around them. If an error happens, it's considered a rejection. For instance, this code: @@ -229,7 +238,7 @@ new Promise(function(resolve, reject) { }); ``` -...Works the same way as: +...Works the same way as this: ```js run new Promise(function(resolve, reject) { @@ -241,35 +250,57 @@ new Promise(function(resolve, reject) { }); ``` -Like there's an invisible `try..catch` around the whole code of the function, that catches errors. +The `Promise` constructor automatically catches the error and treats it as a rejection. -That works not only in the executor, but in handlers as well, for instance: +That works not only in the executor, but in handlers as well. If we `throw` inside `.then` handler, that means a rejected promise, so the control jumps to the nearest error handler. + +Here's an example: ```js run new Promise(function(resolve, reject) { - resolve("ok") + resolve("ok"); }).then(function(result) { *!* - throw new Error("Whoops!"); + // .then returns a rejected promise + throw new Error("Whoops!"); */!* -}) -.catch(function(error) { +}).catch(function(error) { + // and the error is handled here alert(error.message); // Whoops! }); ``` +That's so not only for `throw`, but for any errors, including programming errors as well: + +```js run +new Promise(function(resolve, reject) { + resolve("ok"); +}).then(function(result) { +*!* + blabla(); // no such function +*/!* +}).catch(function(error) { + alert(error.message); // blabla is not defined +}); +``` + +To summarize, a `.then` handler can finish in three ways: + +1. It can return a value (or undefined if there's no `return`). Then the promise returned by `.then` becomes fulfilled, and the next handler is called with that value. +2. It can throw an error. Then the promise returned by `.then` becomes rejected and the closest rejection handler is called. +3. It can return a promise. Then JavaScript awaits its result and goes on with it. + +![](promise-handler-variants.png) ## Rethrowing -As we already noticed, `.catch` is like `try..catch`. We may have as many `.then` as we want, and then use a single `.catch` at the end to handle errors in all of them. +As we already noticed, `.catch` behaves like `try..catch`. We may have as many `.then` as we want, and then use a single `.catch` at the end to handle errors in all of them. -In a regular `try..catch` we can analyze the error and maybe rethrow it can't handle. The same thing is possible for promises. +In a regular `try..catch` we can analyze the error and maybe rethrow it if can't handle. The same thing is possible for promises. -A handler in `.catch` can finish in two ways: - -1. It can return a value or don't return anything. Then the execution continues "normally", the next `.then(onResolved)` handler is called. -2. It can throw an error. Then the execution goes the "error" path, and the closest rejection handler is called. +An error handler has the same 3 outcomes as described above. So if we `throw` inside `.catch`, then the control goes to the next closest error handler. And if we finish normally, then it continues to TODO +TODO TODO Here is an example of the first behavior (the error is handled): ```js run diff --git a/8-async/03-promise-chaining/promise-handler-variants.png b/8-async/03-promise-chaining/promise-handler-variants.png new file mode 100644 index 00000000..912e52d5 Binary files /dev/null and b/8-async/03-promise-chaining/promise-handler-variants.png differ diff --git a/8-async/03-promise-chaining/promise-handler-variants@2x.png b/8-async/03-promise-chaining/promise-handler-variants@2x.png new file mode 100644 index 00000000..0b19f524 Binary files /dev/null and b/8-async/03-promise-chaining/promise-handler-variants@2x.png differ diff --git a/8-async/03-promise-chaining/three.js b/8-async/03-promise-chaining/three.js index 0a6b7d4e..8536e85a 100644 --- a/8-async/03-promise-chaining/three.js +++ b/8-async/03-promise-chaining/three.js @@ -1 +1,3 @@ -let three = 3; +function three() { + alert(3); +} diff --git a/8-async/03-promise-chaining/two.js b/8-async/03-promise-chaining/two.js index 454b7cc8..b04795b8 100644 --- a/8-async/03-promise-chaining/two.js +++ b/8-async/03-promise-chaining/two.js @@ -1 +1,3 @@ -let two = 2; +function two() { + alert(2); +} diff --git a/8-async/03-promise-chaining/user.json b/8-async/03-promise-chaining/user.json new file mode 100644 index 00000000..32f89971 --- /dev/null +++ b/8-async/03-promise-chaining/user.json @@ -0,0 +1,4 @@ +{ + "name": "iliakan", + "isAdmin": true +} diff --git a/figures.sketch b/figures.sketch index 1e1e7718..d1d82568 100644 Binary files a/figures.sketch and b/figures.sketch differ