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@@ -31,8 +31,8 @@ called `getMembers` that retrieves all the members in a discord server. When we
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function we see the following result.
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```js
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const members = getMembers("The Programmers Hangout");
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console.log(members); // Promise {<pending>}
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const members = getMembers("The Programmers Hangout")
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console.log(members) // Promise {<pending>}
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```
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Normally, we would have expected to see an array of all the members but it takes time to
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@@ -44,8 +44,8 @@ to access the actual members like so.
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```js
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getMembers("The Programmers Hangout").then(members => {
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console.log(members); // (32k) [{...}, {...}, {...}]
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});
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console.log(members) // (32k) [{...}, {...}, {...}]
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})
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```
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This way we are able to make sure that we only try to `console.log` when the `getMembers` function has resolved and ready to be used.
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@@ -63,15 +63,15 @@ You may have tried doing something like this before.
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```js
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// Incorrect code, don't copy!
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let results;
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let results
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getWeather("Los Angeles").then(weather => {
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results = weather;
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});
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results = weather
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})
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console.log(results) // undefined
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```
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Why is `results` undefined? Because **Javascript doesn't wait**. Whenever a Promise is created,
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your code will continue to run until there's no more code left in the stack. Only then
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your code will continue to run until there's no more code left in the stack. Only then
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will javascript try to run the `.then` callback of a Promise. Even if your Promise resolves
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immediately you are going to have to wait until you've run all the code in the stack before
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your `.then` callback has a chance to start running. This is due to the way the event loop works,
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@@ -81,8 +81,8 @@ In order to fix this problem we need to move the `console.log` inside the `.then
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```js
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getWeather("Los Angeles").then(weather => {
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console.log(weather); // Sunny, probably
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});
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console.log(weather) // Sunny, probably
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})
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```
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## Real World Example
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@@ -94,14 +94,14 @@ You can try it in your browser if you want to test it out.
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function getCharacters() {
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return fetch(`https://rickandmortyapi.com/api/character`)
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.then(response => response.json())
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.then(response => response.results);
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.then(response => response.results)
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}
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getCharacters().then(characters => {
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console.log(characters); // (20) [{...}, {...}, {...}]
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});
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console.log(characters) // (20) [{...}, {...}, {...}]
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})
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```
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Let's break down what's happening in this function
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// TODO: finish this
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// TODO: finish this
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@@ -15,9 +15,9 @@ function doAsync(number) {
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return new Promise(function(resolve, reject) {
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doDatabase().then(function(dbResult) {
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otherDbFunction(dbResult).then(function(secondResult) {
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resolve(secondResult + 10);
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resolve(secondResult + 10)
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})
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});
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})
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})
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}
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```
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@@ -29,9 +29,9 @@ already returns a promise, you can just return the original thing.
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function doAsync(number) {
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return doDatabase().then(function(dbResult) {
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otherDbFunction(dbResult).then(function(secondResult) {
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return secondResult + 10;
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return secondResult + 10
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})
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});
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})
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}
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```
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@@ -40,11 +40,13 @@ is that they allow you do chain them sequentially.
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```js
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function doAsync(number) {
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return doDatabase().then(function(dbResult) {
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return otherDbFunction(dbResult)
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}).then(function(secondResult) {
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return secondResult + 10;
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});
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return doDatabase()
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.then(function(dbResult) {
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return otherDbFunction(dbResult)
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})
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.then(function(secondResult) {
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return secondResult + 10
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})
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}
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```
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@@ -56,17 +58,18 @@ function doAsync(number) {
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return doDatabase()
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.then(otherDbFunction)
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.then(function(secondResult) {
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return secondResult + 10;
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});
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return secondResult + 10
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})
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}
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```
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And you don't need those returns if you just have ES6 arrow functions
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```js
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const doAsync = number => doDatabase()
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.then(otherDbFunction)
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.then(secondResult => secondResult + 10);
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const doAsync = number =>
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doDatabase()
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.then(otherDbFunction)
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.then(secondResult => secondResult + 10)
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```
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Wow, that last one looks a lot cleaner to me than the first. Keeping that in mind, maybe we could be making some of our other functions cleaner as well
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