Skip to content

Instantly share code, notes, and snippets.

@jed

jed/LICENSE.txt

Forked from 140bytes/LICENSE.txt
Created June 24, 2011 10:20
Show Gist options
  • Save jed/1044540 to your computer and use it in GitHub Desktop.
Save jed/1044540 to your computer and use it in GitHub Desktop.
Download ZIP
Array.prototype.unique
Raw
annotated.js
// from http://twitter.com/WebReflection/status/83867362490720258
Array.prototype.unique = // extend the array prototype
[].unique || // if it doesn't exist
function(
a
){
return function() { // with a function that
return this.filter(a) // filters by the cached function
}
}(
function(a,b,c) { // which
return c.indexOf( // finds out whether the array contains
a, // the item
b + 1 // after the current index
) < 0 // and returns false if it does.
}
)
Raw
index.js
Array.prototype.unique=function(a){return function(){return this.filter(a)}}(function(a,b,c){return c.indexOf(a,b+1)<0})
Raw
LICENSE.txt
DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
Version 2, December 2004
Copyright (C) 2011 Jed Schmidt <http://jed.is>
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 FUCK YOU WANT TO PUBLIC LICENSE
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
0. You just DO WHAT THE FUCK YOU WANT TO.
Raw
package.json
{
"name": "unique",
"description": "Array.prototype.unique, by @WebReflection",
"keywords": [
"array",
"unique"
]
}
Raw
test.html
<!DOCTYPE html>
<title>Foo</title>
<div>Expected value: <b>1,2,3,4,5</b></div>
<div>Actual value: <b id="ret"></b></div>
<script>
Array.prototype.unique=function(a){return function(){return this.filter(a)}}(function(a,b,c){return c.indexOf(a,b+1)<0})
document.getElementById( "ret" ).innerHTML = [1,2,3,4,5,4,3,2,1].unique().sort()
</script>
@neolectron
Copy link

[1,2,3,1].reduce((acc, item) => acc.includes(item) ? acc : acc.concat(item), [])
is simpler

Copy link

ghost commented Oct 27, 2017 •
edited by ghost
Loading 

Array.prototype.uniq =
Array.prototype.unique = 
  ( () => function()
    { return [ ...new Set( this ) ] } 
  ) ()

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment