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currying in javascript

/ Published in: JavaScript
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each in Array,It can operate each element in Array.
e.g.
var result = [1,2,3,4].each(function(x){return Math.sqrt(x);});
//it return sqrt in [1,2,3,4]'s each item

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  1. Array.prototype.each = function(fn){
  2. 	return this.length? [fn(this[0])].concat(this.slice(1).each(fn)): [];
  3. };
  4. //e.g.
  5. var arr = [1,2,3,4].each(function(x){return x*2;});
  6. //alert(arr);//[2,3,6,8]

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