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Created August 16, 2011 06:09
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Throttling and Debouncing
Raw
README.md

Throttling and Debouncing

This function aims to provide both function throttling and debouncing in as few bytes as possible.

Raw
annotated.js
function(
a, // true to debounce, false to throttle
b, // how long to either disallow further (throttle) executions or delay the current (debounce) execution
c, // the callback to throttle or debounce
d // placeholder for holding current timeout context
) {
return function() { // return a new function that
if(a)clearTimeout(d); // if we are debouncing, clear the timeout and
if(a||!d)d=setTimeout(function() { d = null; c()}, b); // if debouncing and an operation running,
} // assign a new timer to run the supplied callback
};
Raw
index.js
function(a,b,c,d){return function(){if(a)clearTimeout(d);if(a||!d)d=setTimeout(function(){d=null;c()},b)}}
Raw
LICENSE.txt
DO WHAT THE **** YOU WANT TO PUBLIC LICENSE
Version 2, December 2004
Copyright (C) 2011 Eli Perelman <http://eliperelman.com>
Everyone is permitted to copy and distribute verbatim or modified
copies of this license document, and changing it is allowed as long
as the name is changed.
DO WHAT THE **** YOU WANT TO PUBLIC LICENSE
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
0. You just DO WHAT THE **** YOU WANT TO.
Raw
package.json
{
"name": "throttleAndDebounce",
"description": "Function throttling or debouncing.",
"keywords": [
"throttle",
"debounce",
"function",
"delay",
"timeout"
]
}
Raw
test.html
<!DOCTYPE html>
<title>Throttle or Debounce</title>
<script>
var throttleOrDebounce = function(a,b,c,d){return function(){if(a)clearTimeout(d);if(a||!d)d=setTimeout(function(){d=null;c()},b)}};
var log = function() {
console.log('waiting to execute...sigh');
};
var debounce = throttleOrDebounce(true, 10000, log);
// won't log until 10 seconds of not calling debounce() have elapsed
debounce();
debounce();
debounce();
debounce();
debounce();
var throttle = throttleOrDebounce(false, 10000, log);
// will log ONLY ONCE after 10 seconds have elapsed no matter how many times throttle() is called
throttle();
throttle();
throttle();
throttle();
throttle();
throttle();
throttle();
</script>
@mathiasbynens
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if(a)clearTimeout(d); // 21 bytes
// could be written as:
a&&clearTimeout(d); // 19 bytes

@gbakernet
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This is not useful for event handlers because the function doesn't have the arguments applied.

e = arguments; // cache arguments
a&&clearTimeout(d); // if we are debouncing, clear the timeout and
if(a||!d)d=setTimeout(function() { d = null; c.apply(d, e)}, b); // if debouncing and an operation running,

Also if you change the order of the arguments you could have defaults. Eg. throttle and default to a time of 100

throttleOrDebounce(log, /* 100, false */ );
throttleOrDebounce(log, 150, true  );

And

e = arguments; // cache arguments
c&&clearTimeout(d); // if we are debouncing, clear the timeout and
if(c||!d)d=setTimeout(function() { d = null; a.apply(d, e)}, b || 100); // if debouncing and an operation running,

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