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
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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