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..f3d77d72 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") @@ -143,69 +166,211 @@ 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". + +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/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(); + }); + }); +}); +``` + +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. + +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 +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(text) { + // ...and here's the content of the remote file + alert(text); // {"name": "iliakan", isAdmin: true} + }); +``` + +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. + +We'll also use arrow functions for brevity: + +```js run +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 the 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/${user.name}`)) + // Load the response as json + .then(response => response.json()) + // Show the avatar image (githubUser.avatar_url) for 3 seconds (maybe animate it) + .then(githubUser => { + let img = document.createElement('img'); + img.src = githubUser.avatar_url; + img.className = "promise-avatar-example"; + document.body.append(img); + + setTimeout(() => img.remove(), 3000); // (*) + }); +``` + +The code works. But there's a potential problem in it. + +Look at the line `(*)`: how can we do something *after* the avatar is removed? For instance, we'd like to show a form for editing that user or something else. + +To make the chain extendable, we need to return a promise that resolves when the avatar finishes showing. + +Here's how: + +```js run +fetch('/article/promise-chaining/user.json') + .then(response => response.json()) + .then(user => fetch(`https://api.github.com/users/${user.name}`)) + .then(response => response.json()) +*!* + .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 ${githubUser.name}`)); +``` + +Now when `setTimeout` runs the function, it calls `resolve(githubUser)`, thus passing the control to the next `.then` in the chain and passing forward the user data. + +As a rule, an asynchronous action should always return a promise. That makes possible to plan actions after it. Even if we don't plan to extend the chain now, we may need it later. + +Finally, we can split the code into reusable functions: + +```js run +function loadJson(url) { + return fetch(url) + .then(response => response.json()); +} + +function loadGithubUser(name) { + return fetch(`https://api.github.com/users/${name}`) + .then(response => response.json()); +} + +function showAvatar(githubUser) { + return 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); + }); +} + +loadJson('/article/promise-chaining/user.json') + .then(user => loadGithubUser(user.name)) + .then(showAvatar) + .then(githubUser => alert(`Finished showing ${githubUser.name}`)); + // ... +``` ## 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. +Asynchronous actions may sometimes fail: in case of an error the corresponding promises becomes rejected. For instance, `fetch` fails if the remote server is not available. We can use `.catch` to handle errors (rejections). -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. +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 practice. -In the example below we append `.catch` to handle all errors in the scripts loading chain: +For instance, in the code below the URL is wrong (no such server) and `.catch` handles the error: ```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); - }); +fetch('https://no-such-server.blabla') // rejects */!* + .then(response => response.json()) + .catch(err => alert(err)) // TypeError: failed to fetch (the text may vary) ``` -In the code above the first `loadScript` call fails, because `ERROR.js` doesn't exist. The control jumps to the closest error handler `(*)`. - -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: - +Or, maybe, everything is all right with the server, but the response is not a valid JSON: ```js run -loadScript("/article/promise-chaining/one.js") - .then(function(script) { +fetch('/') // fetch works fine now, the server responds successfully *!* - return loadScript("/article/promise-chaining/ERROR.js"); -*/!* - }) - .then(function(script) { - return loadScript("/article/promise-chaining/three.js"); - }) - .then(function(script) { - alert('done!'); - }) -*!* - .catch(function(error) { - alert(error.message); - }); + .then(response => response.json()) // rejects: the page is HTML, not a valid json */!* + .catch(err => alert(err)) // SyntaxError: Unexpected token < in JSON at position 0 ``` -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. +In the example below we append `.catch` to handle all errors in the avatar-loading-and-showing chain: + +```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()) + .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); + })) + .catch(error => alert(error.message)); +``` + +Here `.catch` doesn't trigger at all, because there are no errors. But if any of the promises above rejects, then it would execute. ## 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. +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: @@ -214,9 +379,7 @@ new Promise(function(resolve, reject) { *!* throw new Error("Whoops!"); */!* -}).catch(function(error) { - alert(error.message); // Whoops! -}); +}).catch(alert); // Error: Whoops! ``` ...Works the same way as this: @@ -226,14 +389,12 @@ new Promise(function(resolve, reject) { *!* reject(new Error("Whoops!")); */!* -}).catch(function(error) { - alert(error.message); // Whoops! -}); +}).catch(alert); // Error: Whoops! ``` -The `Promise` constructor automatically catches the error and treats it as a rejection. +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. +That's so 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: @@ -242,17 +403,12 @@ new Promise(function(resolve, reject) { resolve("ok"); }).then(function(result) { *!* - // .then returns a rejected promise - throw new Error("Whoops!"); + throw new Error("Whoops!"); // rejects the promise */!* -}).catch(function(error) { - // and the error is handled here - alert(error.message); // Whoops! -}); +}).catch(alert); // Error: Whoops! ``` -That's so not only for `throw`, - but for any errors, including programming errors as well: +That's so not only for `throw`, but for any errors, including programming errors as well: ```js run new Promise(function(resolve, reject) { @@ -261,29 +417,18 @@ new Promise(function(resolve, reject) { *!* blabla(); // no such function */!* -}).catch(function(error) { - alert(error.message); // blabla is not defined -}); +}).catch(alert); // ReferenceError: 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) +As a side effect, the final `.catch` not only catches explicit rejections, but also occasional errors in the handlers above. ## 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: +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` successfully handles the error: ```js run // the execution: catch -> then new Promise(function(resolve, reject) { @@ -292,18 +437,14 @@ new Promise(function(resolve, reject) { }).catch(function(error) { - alert("Handled it!"); -*!* - return "result"; // return, the execution goes the "normal way" -*/!* + alert("The error is handled, continue normally"); -*!* -}).then(alert); // result shown -*/!* +}).then(() => alert("Next successful handler runs")); ``` -...And here's an example of "rethrowing": +Here the `.catch` block finishes normally. So the next successful handler is called. Or it could return something, that would be the same. +...And here the `.catch` block analyzes the error and throws it again: ```js run // the execution: catch -> catch -> then @@ -313,21 +454,27 @@ new Promise(function(resolve, reject) { }).catch(function(error) { // (*) - alert("Can't handle!"); + if (error instanceof URIError) { + // handle it + } else { + alert("Can't handle such error"); *!* - throw error; // throwing this or another error jumps to the next catch + throw error; // throwing this or another error jumps to the next catch */!* + } -}).catch(error => { +}).then(function() { + /* never runs here */ +}).catch(error => { // (**) - alert("Trying to handle again..."); + alert(`The unknown error has occured: ${error}`); // 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. +The handler `(*)` catches the error and just can't handle it, because it's not `URIError`, so it throws it again. Then the execution jumps to the next `.catch` down the chain `(**)`. ## Unhandled rejections @@ -357,7 +504,9 @@ new Promise(function() { 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)): +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 @@ -378,38 +527,28 @@ new Promise(function() { }); ``` -In non-browser environments there are also a similar events, so we can always track unhandled errors in promises. +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. +To summarize, `.then/catch(handler)` returns a new promise that changes depending on what handler does: -That allows to put a "queue" of actions into the chain. +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 until it settles and then acts on its outcome the same way. -Here's a more complex example. The function `showMessage` loads a message and shows it: +The picture of how the promise returned by `.then/catch` changes: -```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) { /*...*/ }); -} +![](promise-handler-variants.png) -function animateMessage(message) { - return new Promise(function(resolve, reject) { - // should be asynchronous animation - alert(message); - resolve(); - }); -} +The smaller picture of how handlers are called: -showMessage(); -``` +![](promise-handler-variants-2.png) + +In the examples of error handling above the `.catch` was always the last in the chain. In practice though, not every promise chain has a `.catch`. Just like regular code is not always wrapped in `try..catch`. + +We should place `.catch` exactly in the places where we want to handle errors and know how to handle them. + +For errors that are outside of that scope we should have the `unhandledrejection` event handler. Such unknown errors are usually unrecoverable, so all we should do is to inform the user and probably report to our server about the incident. 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 index 64f26397..733e0956 100644 --- a/8-async/04-promise-api/article.md +++ b/8-async/04-promise-api/article.md @@ -1,4 +1,42 @@ -# Promises API +# 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. diff --git a/8-async/04-promise-api/head.html b/8-async/04-promise-api/head.html new file mode 100644 index 00000000..8dd44050 --- /dev/null +++ b/8-async/04-promise-api/head.html @@ -0,0 +1,13 @@ + diff --git a/8-async/04-promise-api/one.js b/8-async/04-promise-api/one.js new file mode 100644 index 00000000..948a60e0 --- /dev/null +++ b/8-async/04-promise-api/one.js @@ -0,0 +1,3 @@ +function one() { + alert(1); +} diff --git a/8-async/04-promise-api/three.js b/8-async/04-promise-api/three.js new file mode 100644 index 00000000..8536e85a --- /dev/null +++ b/8-async/04-promise-api/three.js @@ -0,0 +1,3 @@ +function three() { + alert(3); +} diff --git a/8-async/04-promise-api/two.js b/8-async/04-promise-api/two.js new file mode 100644 index 00000000..b04795b8 --- /dev/null +++ b/8-async/04-promise-api/two.js @@ -0,0 +1,3 @@ +function two() { + alert(2); +} 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