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Angelos Chalaris
2020-09-15 16:28:04 +03:00
parent 040efd4380
commit 53c16dbf65
401 changed files with 969 additions and 950 deletions
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8
snippets/runAsync.md
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@ -5,9 +5,9 @@ tags: browser,function,advanced,promise,url
Runs a function in a separate thread by using a [Web Worker](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Using_web_workers), allowing long running functions to not block the UI.
Create a new `Worker` using a `Blob` object URL, the contents of which should be the stringified version of the supplied function.
Immediately post the return value of calling the function back.
Return a promise, listening for `onmessage` and `onerror` events and resolving the data posted back from the worker, or throwing an error.
- Create a new `Worker` using a `Blob` object URL, the contents of which should be the stringified version of the supplied function.
- Immediately post the return value of calling the function back.
- Return a promise, listening for `onmessage` and `onerror` events and resolving the data posted back from the worker, or throwing an error.
```js
const runAsync = fn => {
@ -44,4 +44,4 @@ runAsync(longRunningFunction).then(console.log); // 209685000000
runAsync(() => 10 ** 3).then(console.log); // 1000
let outsideVariable = 50;
runAsync(() => typeof outsideVariable).then(console.log); // 'undefined'
```
```