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@ -58,7 +58,7 @@ let promise = new Promise(function(resolve, reject) {
We can see two things by running the code above:
1. The executor is called automatically and immediately (by `new Promise`).
2. The executor receives two arguments: `resolve` and `reject` — these functions are pre-defined by the JavaScript engine. So we don't need to create them. We only should call one of them when ready.
2. The executor receives two arguments: `resolve` and `reject` — these functions are pre-defined by the JavaScript engine. So we don't need to create them. We should only call one of them when ready.
After one second of "processing" the executor calls `resolve("done")` to produce the result. This changes the state of the `promise` object:
@ -81,7 +81,7 @@ The call to `reject(...)` moves the promise object to `"rejected"` state:
To summarize, the executor should do a job (something that takes time usually) and then call `resolve` or `reject` to change the state of the corresponding promise object.
A promise that is either resolved or rejected is called "settled", as opposed to a initially "pending" promise.
A promise that is either resolved or rejected is called "settled", as opposed to an initially "pending" promise.
````smart header="There can be only a single result or an error"
The executor should call only one `resolve` or one `reject`. Any state change is final.
@ -263,7 +263,7 @@ It's not exactly an alias of `then(f,f)` though. There are several important dif
3. Last, but not least, `.finally(f)` is a more convenient syntax than `.then(f, f)`: no need to duplicate the function `f`.
````smart header="On settled promises handlers runs immediately"
````smart header="On settled promises handlers run immediately"
If a promise is pending, `.then/catch/finally` handlers wait for it. Otherwise, if a promise has already settled, they execute immediately:
```js run
@ -274,7 +274,7 @@ promise.then(alert); // done! (shows up right now)
```
````
Next, let's see more practical examples of how promises can help us to write asynchronous code.
Next, let's see more practical examples of how promises can help us write asynchronous code.
## Example: loadScript [#loadscript]