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Just for fun I decided to see if I could write a faster version of `Array.prototype.concat()`.
var concat = function (arr) { var args = arguments, len = args.length, ArrayTypeOf = "[object Array]", toString = Object.prototype.toString, push = Array.prototype.push; for (var i = 1; i < len; i++) { if (toString.call(args[i]) === ArrayTypeOf) { push.apply(arr, args[i]); } else { arr.push(args[i]); } } return arr; }; |
Benchmark Script.
console.time("native concat()"); for(var i = 0, len = 2020; i < len; i++) console.log( [].concat( new Array(1000).join("ax").split("") ).length ); console.timeEnd("native concat()"); console.time("custom concat()"); for(var i = 0, len = 2020; i < len; i++) console.log( concat( [], new Array(1000).join("ax").split("") ).length ); console.timeEnd("custom concat()"); |
Benchmark results:
native concat(): 386.000ms
custom concat(): 400.000ms
Well, I got quite close but didn’t surpass the raw power of native code.
Here are some other alternatives to concat but with limited functionality.
http://jsperf.com/concat-vs-push-apply/19
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