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atesgoral/leftPad.js

Created July 6, 2009 19:04
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leftPad.js
/**
* Left-pad a number with zeros so that it's at least the given
* number of characters long
* @param n The number to pad
* @param len The desired length
*/
function leftPad(n, len) {
return (new Array(len - String(n).length + 1)).join("0").concat(n);
}
alert(leftPad(42, 6)); // Gives you "000042"
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