Number Format - Thousand Separator in AS3

Flassari — Wed, 12 Aug 2009 21:25:36 +0000

Here’s a short number format function I wrote to easily paste in your code when needed. It’s really handy for currency formatting.
The first parameter (number:*) can be a Number, int, uint or a String class instance.
The last parameter (siStyle:Boolean) specifies whether to use the International System of Units or not. SI units have points between the thousands and a comma for the seperator (123.456.789,01). Putting siStyle as false reverses that behaviour (123,456,789.01).

function numberFormat(number:*, maxDecimals:int = 2, forceDecimals:Boolean = false, siStyle:Boolean = true):String {
    var i:int = 0, inc:Number = Math.pow(10, maxDecimals), str:String = String(Math.round(inc * Number(number))/inc);
    var hasSep:Boolean = str.indexOf(".") == -1, sep:int = hasSep ? str.length : str.indexOf(".");
    var ret:String = (hasSep && !forceDecimals ? "" : (siStyle ? "," : ".")) + str.substr(sep+1);
    if (forceDecimals) for (var j:int = 0; j <= maxDecimals - (str.length - (hasSep ? sep-1 : sep)); j++) ret += "0";
    while (i + 3 < (str.substr(0, 1) == "-" ? sep-1 : sep)) ret = (siStyle ? "." : ",") + str.substr(sep - (i += 3), 3) + ret;
    return str.substr(0, sep - i) + ret;
}

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Number Format - Thousand Separator in AS3