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xfarrow 2024-08-06 12:55:49 +02:00
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4
async-await/1_promises.js
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@ -2,7 +2,7 @@
/* /*
The function passed to Promise is called "executor" The function passed to Promise is called "executor"
and gets executed synchronously the moment the Promise is created. and gets executed synchronously and immediately after the Promise is created.
When the Promise ends, the callback function should When the Promise ends, the callback function should
either call the "resolve" or "reject" callbacks: either call the "resolve" or "reject" callbacks:
resolve(value) — if the job is finished successfully, with result value. resolve(value) — if the job is finished successfully, with result value.
@ -24,7 +24,7 @@ const promise = new Promise(function (resolve, reject) {
/* /*
The first argument of .then is a function that runs when the promise is resolved and receives the result. The first argument of .then is a function that runs when the promise is resolved and receives the result.
The second argument of .then is a function that runs when the promise is rejected and receives the error. The second argument of .then is a function that runs when the promise is rejected and receives the error.
The function passed to "then()" is put in the queue! The function passed to "then()" is put in the Event Loop queue.
*/ */
promise.then( promise.then(
result => console.log('The operation was successful. It returned ' + result), result => console.log('The operation was successful. It returned ' + result),

11
async-await/event-loop.md
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@ -9,20 +9,21 @@ respect to the main flow of execution. Whenever we meet a portion of code that
may not be possible to execute now, it is put in the Event Loop. Let's look at may not be possible to execute now, it is put in the Event Loop. Let's look at
some examples: some examples:
1. **Example 1**
```javascript ```javascript
setTimeout(() => console.log('test'), 1000); setTimeout(() => console.log('test'), 1000);
``` ```
`console.log('test')` will be put in the Event Loop. `console.log('test')` will be put in the Event Loop.
2. **Example 2**
```javascript ```javascript
const promise = new Promise(function (resolve, reject) { const promise = new Promise(function (resolve, reject) {
console.log('test'); console.log('test');
resolve(); resolve();
}).then(() => { }).then(() => {
console.log('test2'); console.log('test2');
}); });
``` ```