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Created June 25, 2011 21:02
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Array.prototype.reduceRight
Raw
annotated.js
// 109 bytes, 153 including 'Array.prototype.reduceRight=[].reduceRight||' ...
function (
a, // callback
b // initialValue and result
){
for (
var c = this, // 'this' shortcut
d = c.length + 1, // iterator
e; // 'undefined' and flag for trailing "holes" in 'c'
d--;
)
b = d in c ? a(b, c[d], d, e = c) : e || b !== e ? b : c[d -= d - 1 in c];
return b
}
Raw
index.js
function(a,b){for(var c=this,d=c.length+1,e;d--;)b=d in c?a(b,c[d],d,e=c):e||b!==e?b:c[d-=d-1 in c];return b}
Raw
LICENSE.txt
DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
Version 2, December 2004
Copyright (C) 2011 Sebastien P. https://twitter.com/#!/_sebastienp
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": "Array.prototype.reduceRight",
"description": "ES5 Array.prototype.reduceRight polyfill",
"keywords": [
"ES5",
"array",
"reduceRight",
"polyfill"
]
}
Raw
test.html
<!DOCTYPE html>
<title>Foo</title>
<div>Expected value: <b>16</b></div>
<div>Actual value: <b id="ret"></b></div>
<script>
Array.prototype.reduceRight=function(a,b){for(var c=this,d=c.length+1,e;d--;)b=d in c?a(b,c[d],d,e=c):e||b!==e?b:c[d-=d-1 in c];return b}
document.getElementById( "ret" ).innerHTML = [,,,1,2,,3,,,,,,].reduceRight(function(a,b){return a+b},10)
</script>
@Kambfhase
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Your code fails for the initialValue -1.

@sebastien-p
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Author

@Kambfhase : thanks. This code is not the right way to do the trick, I'm currently working on a major rewrite.

@sebastien-p
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Author

Please, help me, I'm too tired to keep trying for today

@jed
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jed commented Jun 27, 2011

i wonder if a recursive solution would be shorter?

@sebastien-p
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I'm still working on it, please someone take a look at the current version and help me, I know we can do this ! Thanks.

@bytespider
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My current version http://jsfiddle.net/vmFbp/2/

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