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Simplest way for leading zero padding in JavaScript
Number.prototype.pad = function(size) {
var s = String(this);
while (s.length < (size || 2)) {s = "0" + s;}
return s;
}
(1).pad(3) // => "001"
(10).pad(3) // => "010"
(100).pad(3) // => "100"
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