30 lines
859 B
Markdown
30 lines
859 B
Markdown
---
|
|
title: Defer function invocation
|
|
type: snippet
|
|
language: javascript
|
|
tags: [function]
|
|
cover: shiny-mountains
|
|
dateModified: 2020-10-22T20:23:47+03:00
|
|
---
|
|
|
|
Defers invoking a function until the current call stack has cleared.
|
|
|
|
- Use `setTimeout()` with a timeout of `1` ms to add a new event to the event queue and allow the rendering engine to complete its work.
|
|
- Use the spread (`...`) operator to supply the function with an arbitrary number of arguments.
|
|
|
|
```js
|
|
const defer = (fn, ...args) => setTimeout(fn, 1, ...args);
|
|
```
|
|
|
|
```js
|
|
// Example A:
|
|
defer(console.log, 'a'), console.log('b'); // logs 'b' then 'a'
|
|
|
|
// Example B:
|
|
document.querySelector('#someElement').innerHTML = 'Hello';
|
|
longRunningFunction();
|
|
// Browser will not update the HTML until this has finished
|
|
defer(longRunningFunction);
|
|
// Browser will update the HTML then run the function
|
|
```
|