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streunerlein/gist:3378008

Created August 17, 2012 11:05
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Array.map() that works with undefined values in Array
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gistfile1.txt
Array.prototype.ownMap = function(fn) { var a = new Array(this.length); for (var i = 0; i < this.length; i++) a[i] = fn(this[i]); return a; }
// t = new Array(4)
// > [undefined × 4]
// t.ownMap(function(d) { return "Q"; })
// > ["Q", "Q", "Q", "Q"]
// t
// > [undefined × 4]
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