diff --git a/1-js/03-code-quality/01-debugging-chrome/chrome-open-sources.png b/1-js/03-code-quality/01-debugging-chrome/chrome-open-sources.png index efa3c19d..7d779337 100644 Binary files a/1-js/03-code-quality/01-debugging-chrome/chrome-open-sources.png and b/1-js/03-code-quality/01-debugging-chrome/chrome-open-sources.png differ diff --git a/1-js/03-code-quality/01-debugging-chrome/chrome-open-sources@2x.png b/1-js/03-code-quality/01-debugging-chrome/chrome-open-sources@2x.png index e184bdd0..bdc8d72c 100644 Binary files a/1-js/03-code-quality/01-debugging-chrome/chrome-open-sources@2x.png and b/1-js/03-code-quality/01-debugging-chrome/chrome-open-sources@2x.png differ diff --git a/8-async/01-callback-hell/01-animate-circle-callback/solution.md b/8-async/01-callbacks/01-animate-circle-callback/solution.md similarity index 100% rename from 8-async/01-callback-hell/01-animate-circle-callback/solution.md rename to 8-async/01-callbacks/01-animate-circle-callback/solution.md diff --git a/8-async/01-callback-hell/01-animate-circle-callback/solution.view/index.html b/8-async/01-callbacks/01-animate-circle-callback/solution.view/index.html similarity index 100% rename from 8-async/01-callback-hell/01-animate-circle-callback/solution.view/index.html rename to 8-async/01-callbacks/01-animate-circle-callback/solution.view/index.html diff --git a/8-async/01-callback-hell/01-animate-circle-callback/task.md b/8-async/01-callbacks/01-animate-circle-callback/task.md similarity index 100% rename from 8-async/01-callback-hell/01-animate-circle-callback/task.md rename to 8-async/01-callbacks/01-animate-circle-callback/task.md diff --git a/8-async/01-callback-hell/article.md b/8-async/01-callbacks/article.md similarity index 56% rename from 8-async/01-callback-hell/article.md rename to 8-async/01-callbacks/article.md index adc1561e..e9960e45 100644 --- a/8-async/01-callback-hell/article.md +++ b/8-async/01-callbacks/article.md @@ -1,8 +1,10 @@ -# Callback hell - -Consider this function `loadScript(src)` that loads a script: +# Introduction: sync vs async, callbacks + +Many actions in Javascript are *asynchronous*. + +For instance, take a look at the function `loadScript(src)` that loads a script: ```js function loadScript(src) { @@ -12,7 +14,7 @@ function loadScript(src) { } ``` -When the script element is added to the document, the browser loads it and executes. 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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 c14a5416..85ee6844 100644 --- a/8-async/03-promise-chaining/article.md +++ b/8-async/03-promise-chaining/article.md @@ -1,7 +1,7 @@ # Promises chaining -Let's formulate the problem mentioned in the chapter : +Let's return to the problem mentioned in the chapter : - We have a sequence of asynchronous tasks to be done one after another. For instance, loading scripts. - How to code it well? @@ -24,7 +24,7 @@ new Promise(function(resolve, reject) { alert(result); // 1 return result * 2; -}).then(function(result) { +}).then(function(result) { // (***) alert(result); // 2 return result * 2; @@ -37,15 +37,40 @@ new Promise(function(resolve, reject) { }); ``` -Here the first promise resolves in 1 second `(*)`, then the first handler is called `(**)`, its result is passed down to the second one etc. The result is passed along the chain of handlers, so we can see a sequence of `alert` calls: `1` -> `2` -> `4`. +The idea is that the result is passed through the chain of `.then` handlers. + +Here the flow is: +1. The initial promise resolves in 1 second `(*)`, +2. Then the `.this` handler is called `(**)`. +3. The value that it returns is passed to the next `.this` handler `(***)` +4. ...and so on. + +As the result is passed along the chain of handlers, we can see a sequence of `alert` calls: `1` -> `2` -> `4`. ![](promise-then-chain.png) -The whole thing works, because a call to `promise.then` returns a promise, so that we can call next `.then` on it, to get a new promise and so on. +The whole thing works, because a call to `promise.then` returns a promise, so that we can call next `.then` on it. -A result of a handler becomes a result of the promise returned by the corresponding `.then`. +When a handler returns a value, it becomes the result of that promise, so the next `.then` is called with it. -Please note: technically we can also add many `.then` to a single promise, without any chaining, like here: +To make things clear, here's the start of the chain: + +```js run +new Promise(function(resolve, reject) { + + setTimeout(() => resolve(1), 1000); + +}).then(function(result) { + + alert(result); // 1 + return result * 2; // (1) + +}) // <-- (2) +``` + +The value returned by `.then` is a promise, so we can add another `.then` at `(2)`. When the value is returned in `(1)`, that promise becomes resolved, so the next handler triggers with it. + +Unlike the chaining, technically we can also add many `.then` to a single promise, like this: ```js run let promise = new Promise(function(resolve, reject) { @@ -68,13 +93,13 @@ promise.then(function(result) { }); ``` -...But that's a totally different thing. All `.then` on the same promise get the same result -- the result of that promise: +...But that's a totally different thing. Here's the picture (compare it with the chaining above): ![](promise-then-many.png) -So in the code above all `alert` show the same: 1. There is no result-passing between them. +All `.then` on the same promise get the same result -- the result of that promise. So in the code above all `alert` show the same: `1`. There is no result-passing between them. -In practice chaining is used far more often than adding many handlers to the same promise. +In practice we rarely need multiple handlers for one promise. Chaining is used much more often. ## Returning promises @@ -94,20 +119,18 @@ new Promise(function(resolve, reject) { alert(result); // 1 *!* - return new Promise((resolve, reject) => { + return new Promise((resolve, reject) => { // (*) setTimeout(() => resolve(result * 2), 1000); }); */!* -}).then(function(result) { +}).then(function(result) { // (**) alert(result); // 2 -*!* return new Promise((resolve, reject) => { setTimeout(() => resolve(result * 2), 1000); }); -*/!* }).then(function(result) { @@ -116,15 +139,15 @@ new Promise(function(resolve, reject) { }); ``` -Here each `.then` returns `new Promise(…)`. When it settles, the result is passed on. +Here the first `.then` shows `1` returns `new Promise(…)` in the line `(*)`. After one second it resolves, and the result is passed on to handler of the second `.then` in the line `(**)`, that shows `2` and so on. -So the output is again 1 -> 2 > 4, but with 1 second delay between `alert` calls. +So the output is again 1 -> 2 > 4, but now with 1 second delay between `alert` calls. -That feature allows to build chains of asynchronous actions. +Returning promises allows us to build chains of asynchronous actions. ## Example: loadScript -Let's use it with `loadScript` to load scripts one by one, sequentially: +Let's use this feature with `loadScript` to load scripts one by one, in sequence: ```js run loadScript("/article/promise-chaining/one.js") @@ -143,273 +166,156 @@ loadScript("/article/promise-chaining/one.js") }); ``` -Here each `loadScript` call returns a promise, and the next `.then` awaits until it resolves. So scripts are loaded one after another. +Here each `loadScript` call returns a promise, and the next `.then` runs when it resolves. Then it initiates the loading of the next script. So scripts are loaded one after another. -We can add more asynchronous actions to the chain, and the code is still "flat", no signs of "pyramid of doom". +We can add more asynchronous actions to the chain. Please note that code is still "flat", it grows down, not to the right. There are no signs of "pyramid of doom". -## Error handling - -Asynchronous actions may sometimes fail. For instance, `loadScript` fails if there's no such script. In that case the promise becomes rejected, so we can use `.catch` to handle it. - -Luckily, chaining is great for catching errors. When a promise rejects, the control jumps to the closest rejection handler down the chain. That's very convenient. - -In the example below we append `.catch` to handle all errors in the scripts loading chain: +Please note that technically it is also possible to write `.then` directly after each promise, without returning them, like this: ```js run -*!* -loadScript("/article/promise-chaining/ERROR.js") -*/!* - .then(function(script) { - return loadScript("/article/promise-chaining/two.js"); - }) - .then(function(script) { - return loadScript("/article/promise-chaining/three.js"); - }) - .then(function(script) { - alert('done!'); - }) -*!* - .catch(function(error) { // (*) - alert(error.message); +loadScript("/article/promise-chaining/one.js").then(function(script1) { + loadScript("/article/promise-chaining/two.js").then(function(script2) { + loadScript("/article/promise-chaining/three.js").then(function(script3) { + // this function has access to variables script1, script2 and script3 (*) + one(); + two(); + three(); + }); }); -*/!* +}); ``` -In the code above the first `loadScript` call fails, because `ERROR.js` doesn't exist. The control jumps to the closest error handler `(*)`. +This code does the same: loads 3 scripts in sequence. But it "grows to the right". So we have the same problem as with callbacks. Use chaining (return promises from `.then`) to evade it. -In the example below the second script fails to load. Please note that the same `.catch` handles it, just because it's the closest one down the chain: +Sometimes it's ok to write `.then` directly, because the nested function has access to the outer scope `(*)`, but that's an exception rather than a rule. +## Bigger example: fetch + +In frontend programming promises are often used for network requests. So let's make an example of that. + +We'll use the [fetch](mdn:api/WindowOrWorkerGlobalScope/fetch) method to load the information about the user from the remote server. The method is quite complex, it has many optional parameters, but the basic usage is quite simple: + +```js +let promise = fetch(url); +``` + +Makes a network request to the `url` and returns a promise. The promise resolves with a `response` object when the remote server responds with headers, but before the full response is downloaded. + +To read the full response, we should call a method `response.text()`: it returns a promise that resolves with the full response text when it's downloaded from the remote server. + +The code below makes a request to `user.json` and then loads it as text from the server: ```js run -loadScript("/article/promise-chaining/one.js") - .then(function(script) { -*!* - return loadScript("/article/promise-chaining/ERROR.js"); -*/!* +fetch('/article/promise-chaining/user.json') + // .then runs when the remote server responds + .then(function(response) { + // response.text() is the new promise that resolves when the server finishes sending data + return response.text(); }) - .then(function(script) { - return loadScript("/article/promise-chaining/three.js"); - }) - .then(function(script) { - alert('done!'); - }) -*!* - .catch(function(error) { - alert(error.message); + .then(function(text) { + // ...and here's the content of the remote file + alert(text); // {"name": "iliakan", isAdmin: true} }); -*/!* ``` -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. +There is also a method `response.json()` that reads the remote data and parses it as JSON. In our case that's even more convenient. - -## Implicit try..catch - -The code inside the executor and handlers has something like an invisible `try..catch` around it. If an error happens, it's considered a rejection. - -For instance, this code: +We'll also use arrow functions for brevity: ```js run -new Promise(function(resolve, reject) { +fetch('/article/promise-chaining/user.json') + .then(response => response.json()) + .then(user => alert(user.name)); // iliakan +``` + +Now let's do something with it. For instance, we can make one more request to github, load the user profile and show its avatar: + +```js run +// 1. Make a request for user.json +fetch('/article/promise-chaining/user.json') + // Load it as json + .then(response => response.json()) + // Make a request to github + .then(user => fetch(`https://api.github.com/users/${user.name}`)) + // Load the response as json + .then(response => response.json()) + // Show the avatar image (githubUser.avatar_url) for 3 seconds (maybe animate it) + .then(githubUser => { + let img = document.createElement('img'); + img.src = githubUser.avatar_url; + img.className = "promise-avatar-example"; + document.body.append(img); + + setTimeout(() => img.remove(), 3000); // (*) + }); +``` + +Now it works. But there's a potential problem in the code. + +Look at the line `(*)`: how can we do something *after* the avatar is removed? For instance, we'd like to show a form for editing that user or something else. + +To make the chain extendable, we need to return a promise that resolves when the avatar finishes showing. + +Here's how: + +```js run +fetch('/article/promise-chaining/user.json') + .then(response => response.json()) + .then(user => fetch(`https://api.github.com/users/${user.name}`)) + .then(response => response.json()) *!* - throw new Error("Whoops!"); -*/!* -}).catch(function(error) { - alert(error.message); // Whoops! -}); + .then(githubUser => new Promise(function(resolve, reject) { + let img = document.createElement('img'); + img.src = githubUser.avatar_url; + img.className = "promise-avatar-example"; + document.body.append(img); + + setTimeout(() => { + img.remove(); + resolve(githubUser); + }, 3000); + })) + */!* + // triggers after 3 seconds + .then(githubUser => alert(`Finished showing ${githubUser.name}`)); ``` -...Works the same way as this: +An async action should always return a promise. That makes possible to plan actions after it. + +Finally, we can split it into reusable functions: ```js run -new Promise(function(resolve, reject) { -*!* - reject(new Error("Whoops!")); -*/!* -}).catch(function(error) { - alert(error.message); // Whoops! -}); -``` - -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. 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"); -}).then(function(result) { -*!* - // .then returns a rejected promise - throw new Error("Whoops!"); -*/!* -}).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 promise 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` 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 if can't handle. The same thing is possible for promises. - -If we `throw` inside `.catch`, then the control goes to the next closest error handler. And if we finish normally, then it continues to the closest successful `.then` handler. - -In the example below the error is fully handled, and the execution continues normally: - -```js run -// the execution: catch -> then -new Promise(function(resolve, reject) { - - throw new Error("Whoops!"); - -}).catch(function(error) { - - alert("Handled it!"); -*!* - return "result"; // return, the execution goes the "normal way" -*/!* - -*!* -}).then(alert); // result shown -*/!* -``` - -...And here's an example of "rethrowing": - - -```js run -// the execution: catch -> catch -> then -new Promise(function(resolve, reject) { - - throw new Error("Whoops!"); - -}).catch(function(error) { // (*) - - alert("Can't handle!"); - -*!* - throw error; // throwing this or another error jumps to the next catch -*/!* - -}).catch(error => { - - alert("Trying to handle again..."); - // don't return anything => execution goes the normal way - -}).then(alert); // undefined -``` - -The handler `(*)` catches the error. In real project it would try to handle it somehow, but here it just throws it again. So the execution jumps to the next `.catch` down the chain. - -## Unhandled rejections - -...But what if we forget to append an error handler to the end of the chain? - -Like here: - -```js untrusted run refresh -new Promise(function() { - errorHappened(); // Error here (no such function) -}); -``` - -Or here: - -```js untrusted run refresh -new Promise(function() { - throw new Error("Whoops!"); -}).then(function() { - // ...something... -}).then(function() { - // ...something else... -}).then(function() { - // ...but no catch after it! -}); -``` - -Technically, when an error happens, the promise state becomes "rejected", and the execution should jump to the closest rejection handler. But there is no such handler in the examples above. - -Usually that means that the code is bad. Most JavaScript engines track such situations and generate a global error. In the browser we can catch it using `window.addEventListener('unhandledrejection')` (as specified in the [HTML standard](https://html.spec.whatwg.org/multipage/webappapis.html#unhandled-promise-rejections)): - - -```js run -window.addEventListener('unhandledrejection', function(event) { - // the event object has two special properties: - alert(event.promise); // [object Promise] - the promise that generated the error - alert(event.reason); // Error: Whoops! - the unhandled error object -}); - -new Promise(function() { - throw new Error("Whoops!"); -}).then(function() { - // ...something... -}).then(function() { - // ...something else... -}).then(function() { - // ...but no catch after it! -}); -``` - -In non-browser environments there are also a similar events, so we can always track unhandled errors in promises. - -## Summary - -- A call to `.then/catch` returns a promise, so we can chain them. -- There are 3 possible outcomes of a handler: - 1. Return normally -- the result is passed to the closest successful handler down the chain. - 2. Throw an error -- it is passed to the closest rejection handler down the chain. - 3. Return a promise -- the chain waits till it settles, and then its result is used. - -That allows to put a "queue" of actions into the chain. - -Here's a more complex example. The function `showMessage` loads a message and shows it: - -```js run -function showMessage() { - return new Promise(function(resolve, reject) { - alert('loading...'); - return loadScript('/article/promise-chaining/getMessage.js'); - }).then(function(script) { - let message = getMessage(); // getMessage function comes from the script - return animateMessage(message); - }).catch(function(err) { /*...*/ }); +function loadJson(url) { + return fetch(url) + .then(response => response.json()); } -function animateMessage(message) { +function loadGithubUser(name) { + return fetch(`https://api.github.com/users/${name}`) + .then(response => response.json()); +} + +function showAvatar(githubUser) { return new Promise(function(resolve, reject) { - // should be asynchronous animation - alert(message); - resolve(); + let img = document.createElement('img'); + img.src = githubUser.avatar_url; + img.className = "promise-avatar-example"; + document.body.append(img); + + setTimeout(() => { + img.remove(); + resolve(githubUser); + }, 3000); }); } -showMessage(); +loadJson('/article/promise-chaining/user.json') + .then(user => loadGithubUser(user.name)) + .then(showAvatar) + .then(githubUser => alert(`Finished showing ${githubUser.name}`)); + // ... ``` + +Now when `setTimeout` runs the function, it calls `resolve(githubUser)`, thus passing the control to the next `.then` in the chain and passing forward the user data. + +Here we assumed that everything works as intended. But that's not always the case. In the next chapter we'll talk about error handling. diff --git a/8-async/03-promise-chaining/head.html b/8-async/03-promise-chaining/head.html index 8dd44050..0a0075fb 100644 --- a/8-async/03-promise-chaining/head.html +++ b/8-async/03-promise-chaining/head.html @@ -11,3 +11,12 @@ function loadScript(src) { }); } + + diff --git a/8-async/03-promise-chaining/promise-handler-variants-2.png b/8-async/03-promise-chaining/promise-handler-variants-2.png new file mode 100644 index 00000000..1b4eff7a Binary files /dev/null and b/8-async/03-promise-chaining/promise-handler-variants-2.png differ diff --git a/8-async/03-promise-chaining/promise-handler-variants-2@2x.png b/8-async/03-promise-chaining/promise-handler-variants-2@2x.png new file mode 100644 index 00000000..241733fb Binary files /dev/null and b/8-async/03-promise-chaining/promise-handler-variants-2@2x.png differ diff --git a/8-async/03-promise-chaining/promise-handler-variants.png b/8-async/03-promise-chaining/promise-handler-variants.png index 912e52d5..541c18eb 100644 Binary files a/8-async/03-promise-chaining/promise-handler-variants.png 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 index 0b19f524..3a2f6b1d 100644 Binary files a/8-async/03-promise-chaining/promise-handler-variants@2x.png and b/8-async/03-promise-chaining/promise-handler-variants@2x.png differ diff --git a/8-async/04-promise-api/article.md b/8-async/04-promise-api/article.md deleted file mode 100644 index 64f26397..00000000 --- a/8-async/04-promise-api/article.md +++ /dev/null @@ -1,15 +0,0 @@ -# Promises API - -Let's meet more functions and methods for promises. - - - -Keywords `async` and `await` provide a more elegant way to write the code using promises. - -## Async functions - -The `async` function is like a regular one, but it wraps a returned value in a `Promise`. - - - -Nowadays, promises are de-facto standard for asynchronous actions, when we need to diff --git a/8-async/04-promise-error/article.md b/8-async/04-promise-error/article.md new file mode 100644 index 00000000..5ccf7d5d --- /dev/null +++ b/8-async/04-promise-error/article.md @@ -0,0 +1,287 @@ +# Error handling + +Asynchronous actions may sometimes fail: errors are possible, so corresponding promises can become rejected. For instance, `loadScript` fails if there's no such script. We can use `.catch` to handle errors (rejections). + +Promise chaining is great at that aspect. When a promise rejects, the control jumps to the closest rejection handler down the chain. That's very convenient. + +In the example below we append `.catch` to handle all errors in the scripts loading chain: + +```js run +*!* +loadScript("NO_SUCH_SCRIPT.js") +*/!* + .then(function(script) { + return loadScript("/article/promise-chaining/two.js"); + }) + .then(function(script) { + return loadScript("/article/promise-chaining/three.js"); + }) + .then(function(script) { + alert('done!'); + }) +*!* + .catch(function(error) { // (*) + alert(error.message); + }); +*/!* +``` + +In the code above the first `loadScript` call fails, because `NO_SUCH_SCRIPT.js` doesn't exist. The control jumps to the closest error handler `(*)`. + +Now let's see what happens if the second script fails to load. Actually, the same `.catch` handles it, just because it's the closest one down the chain: + + +```js run +loadScript("/article/promise-chaining/one.js") + .then(function(script) { +*!* + return loadScript("NO_SUCH_SCRIPT.js"); +*/!* + }) + .then(function(script) { + return loadScript("/article/promise-chaining/three.js"); + }) + .then(function(script) { + alert('done!'); + }) +*!* + .catch(function(error) { + alert(error.message); + }); +*/!* +``` + +The `.catch` works similarly to the `try..catch` construct. 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 + +The code of the executor and promise handlers has an "invisible `try..catch`" around it. If an error happens, it gets caught and treated as a rejection. + +For instance, this code: + +```js run +new Promise(function(resolve, reject) { +*!* + throw new Error("Whoops!"); +*/!* +}).catch(function(error) { + alert(error.message); // Whoops! +}); +``` + +...Works the same way as this: + +```js run +new Promise(function(resolve, reject) { +*!* + reject(new Error("Whoops!")); +*/!* +}).catch(function(error) { + alert(error.message); // Whoops! +}); +``` + +The "invisible `try..catch`" around the executor automatically catches the error and treats it as a rejection. + +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"); +}).then(function(result) { +*!* + // .then returns a rejected promise + throw new Error("Whoops!"); +*/!* +}).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 +}); +``` + +## The full picture + +To summarize, `.then/catch(handler)` returns a new promise that changes depending on what handler does: + +1. If it returns a value or finishes without a `return` (same as `return undefined`), then the new promise becomes resolved, and the closest resolve handler (the first argument of `.then`) is called with that value. +2. If it throws an error, then the new promise becomes rejected, and the closest rejection handler (second argument of `.then` or `.catch`) is called with it. +3. If it returns a promise, then JavaScript waits for its result and goes on with it as described above. + +The picture of how the promise returned by `.then/catch` changes: + +![](promise-handler-variants.png) + +The smaller picture of how handlers are called: + +![](promise-handler-variants-2.png) + +## Rethrowing + +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 if can't handle. The same thing is possible for promises. + +If we `throw` inside `.catch`, then the control goes to the next closest error handler. And if we handle the error and finish normally, then it continues to the closest successful `.then` handler. + +In the example below the `.catch` handles the error and finishes with `return`, so the execution continues normally, the control goes to the next `.then`: + +```js run +// the execution: catch -> then +new Promise(function(resolve, reject) { + + throw new Error("Whoops!"); + +}).catch(function(error) { + + alert("Handled it!"); +*!* + return "result"; // return, the execution goes the "normal way" +*/!* + +*!* +}).then(alert); // result shown +*/!* +``` + +...And here's an example of "rethrowing": + + +```js run +// the execution: catch -> catch -> then +new Promise(function(resolve, reject) { + + throw new Error("Whoops!"); + +}).catch(function(error) { // (*) + + alert("Can't handle the error here!"); + +*!* + throw error; // throwing this or another error jumps to the next catch +*/!* + +}).catch(error => { // (**) + + alert("The error is fully handled."); + // don't return anything => execution goes the normal way + +}); +``` + +The handler `(*)` catches the error and just can't handle it. In real project it would try to analyze the error object, but here it just throws it again. So the execution jumps to the next `.catch` down the chain `(**)`. + +## Unhandled rejections + +...But what if we forget to append an error handler to the end of the chain? + +Like here: + +```js untrusted run refresh +new Promise(function() { + errorHappened(); // Error here (no such function) +}); +``` + +Or here: + +```js untrusted run refresh +new Promise(function() { + throw new Error("Whoops!"); +}).then(function() { + // ...something... +}).then(function() { + // ...something else... +}).then(function() { + // ...but no catch after it! +}); +``` + +Technically, when an error happens, the promise state becomes "rejected", and the execution should jump to the closest rejection handler. But there is no such handler in the examples above. + +Usually that means that the code is bad. Indeed, how come that there's no error handling? + +Most JavaScript engines track such situations and generate a global error in that case. In the browser we can catch it using `window.addEventListener('unhandledrejection')` as specified in the [HTML standard](https://html.spec.whatwg.org/multipage/webappapis.html#unhandled-promise-rejections): + + +```js run +window.addEventListener('unhandledrejection', function(event) { + // the event object has two special properties: + alert(event.promise); // [object Promise] - the promise that generated the error + alert(event.reason); // Error: Whoops! - the unhandled error object +}); + +new Promise(function() { + throw new Error("Whoops!"); +}).then(function() { + // ...something... +}).then(function() { + // ...something else... +}).then(function() { + // ...but no catch after it! +}); +``` + +Now if an error has occured, and there's no `.catch`, the event `unhandledrejection` triggers, and our handler can do something with the exception. Once again, such situation is usually a programming error. + +In non-browser environments like Node.JS there are other similar ways to track unhandled errors. + +## Summary + +- A call to `.then/catch` returns a promise, so we can chain them. +- There are 3 possible outcomes of a handler: + 1. Return normally -- the result is passed to the closest successful handler down the chain. + 2. Throw an error -- it is passed to the closest rejection handler down the chain. + 3. Return a promise -- the chain waits till it settles, and then its result is used. + +That allows to form a "queue" of actions in the chain. + +The great thing about chaining is that we can always append more actions to it. + +For instance, the `showMessage()` function below loads a script, and then animates a message: + +```js run +function showMessage() { + return new Promise(function(resolve, reject) { + alert('loading...'); + return loadScript('/article/promise-chaining/getMessage.js'); + }).then(function(script) { + let message = getMessage(); // getMessage function comes from the script + return animateMessage(message); + }).catch(function(err) { /*...*/ }); +} + +function animateMessage(message) { + return new Promise(function(resolve, reject) { + // ...imagine the code for an asynchronous CSS-animation here... + alert(message); + resolve(); + }); +} + +showMessage(); +``` + +We can add more actions like this: +```js +showMessage() + .then(function() { + // the code to run after the message is shown + }); +``` diff --git a/8-async/05-promise-api/article.md b/8-async/05-promise-api/article.md new file mode 100644 index 00000000..733e0956 --- /dev/null +++ b/8-async/05-promise-api/article.md @@ -0,0 +1,53 @@ +# Promise API + +There are helpful static methods in the `Promise` class. There are only 4 of them, so we'll quickly cover them here. + +## Promise.all + +The method to run many promises in parallel and wait till all of them are ready. + +The syntax is: + +```js +let promise = Promise.all(iterable); +``` + +It takes an `iterable` object with promises, for instance an array and returns a new promise that resolves with the array of their results when all of them are settled, or rejects with the first encountered error if any. + +For instance: + +```js run +// loads 3 scripts in parallel and returns an array of them +Promise.all([ + loadScript('/article/promise-api/one.js'), + loadScript('/article/promise-api/two.js'), + loadScript('/article/promise-api/three.js') +]).then(scripts => { + alert(`scripts loaded: ${scripts}`); +}); +``` + + + +- the returned `promise` awaits for al + +In the previous chapter we saw how to run things sequentially. Promises also + +- Promise.all +- Promise.race +- Promise.reject +- Promise.resolve + +Let's meet more functions and methods for promises. + + + +Keywords `async` and `await` provide a more elegant way to write the code using promises. + +## Async functions + +The `async` function is like a regular one, but it wraps a returned value in a `Promise`. + + + +Nowadays, promises are de-facto standard for asynchronous actions, when we need to diff --git a/8-async/05-promise-api/head.html b/8-async/05-promise-api/head.html new file mode 100644 index 00000000..8dd44050 --- /dev/null +++ b/8-async/05-promise-api/head.html @@ -0,0 +1,13 @@ + diff --git a/8-async/05-promise-api/one.js b/8-async/05-promise-api/one.js new file mode 100644 index 00000000..948a60e0 --- /dev/null +++ b/8-async/05-promise-api/one.js @@ -0,0 +1,3 @@ +function one() { + alert(1); +} diff --git a/8-async/05-promise-api/three.js b/8-async/05-promise-api/three.js new file mode 100644 index 00000000..8536e85a --- /dev/null +++ b/8-async/05-promise-api/three.js @@ -0,0 +1,3 @@ +function three() { + alert(3); +} diff --git a/8-async/05-promise-api/two.js b/8-async/05-promise-api/two.js new file mode 100644 index 00000000..b04795b8 --- /dev/null +++ b/8-async/05-promise-api/two.js @@ -0,0 +1,3 @@ +function two() { + alert(2); +} diff --git a/8-async/05-async-await/article.md b/8-async/06-async-await/article.md similarity index 100% rename from 8-async/05-async-await/article.md rename to 8-async/06-async-await/article.md diff --git a/8-async/index.md b/8-async/index.md index 7ffeeaf9..80d3935a 100644 --- a/8-async/index.md +++ b/8-async/index.md @@ -2,4 +2,4 @@ development: true --- -# Promises, async/await +# The art of async programming: promises, async/await diff --git a/figures.sketch b/figures.sketch index b2cea073..9d252bc8 100644 Binary files a/figures.sketch and b/figures.sketch differ