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memoize.js - a faster JavaScript memoizer
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/* | |
* memoize.js | |
* by @philogb and @addyosmani | |
* further optimizations by @mathias | |
* Released under an MIT license. | |
*/ | |
function memoize( fn ) { | |
return function () { | |
var args = Array.prototype.slice.call(arguments), | |
hash = "", | |
i = args.length; | |
toString = Object.prototype.toString, | |
callEm = toString.call({}), | |
currentArg=null; | |
while(i--){ | |
currentArg = args[i]; | |
hash += (callEm == toString.call(currentArg)) ? | |
JSON.stringify(currentArg) : currentArg; | |
fn.memoize || (fn.memoize || {}); | |
//old: fn.memoize = fn.memoize || {}; | |
} | |
return (hash in fn.memoize) ? fn.memoize[hash] : | |
fn.memoize[hash] = fn.apply( this , args ); | |
}; | |
} | |
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