Actionscript:
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trace(formatNum(1000));
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trace(formatNum(10000000));
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trace(formatNum(1000000.39485));
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function formatNum(num:Number):String {
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var newStr:String = "";
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var str:String = num.toString();
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var parts:Array = str.split(".");
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str = parts[0];
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var end:String = (parts[1]) ? "." + parts[1] : "";
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var i:int = str.length;
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while(i--> 0){
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var char:String = str.charAt(i);
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if ((str.length - i) % 3 == 0){
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newStr = "," + char +newStr;
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}else{
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newStr = char + newStr;
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}
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}
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return newStr + end;
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}
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/*
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outputs:
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1,000
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10,000,000
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1,000,000.39485
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*/
The function formatNum() returns a string given a number argument ... it adds commas where appropriate and takes into account decimal values. This is useful anywhere you need to display numbers over 1,000, in a game, in a calculator app etc...