30-seconds-of-code/snippets/defer.md

title, tags, expertise, firstSeen, lastUpdated

title	tags	expertise	firstSeen	lastUpdated
Defer function invocation	function	intermediate	2018-01-01T23:40:31+02:00	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.

const defer = (fn, ...args) => setTimeout(fn, 1, ...args);

// 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