ear-fung.us I’m a programmer. I’m also pro-grammar.

Flash’s Built-in Rounding Function is Severely Limited

Now that I'm working more and more in Flash ActionScript 3 I'll be posting some of my findings about it here.

My first AS3 related post is about the Math.round() function. This function will only round to a whole number (int). What if I have 3.74257444 and need a result of 3.74 instead of what Math.round() would give me: 4?

Well, here's the solution:

function roundDecimal(num:Number, places:Number):Number
{
return int( (num) * Math.pow(10, places) ) / Math.pow(10, places);
}

This function will return the specified amount of decimal places rounded correctly.

Example usage:

var myNumber:Number = 3.74257444;
trace(roundDecimal(myNumber, 2)); //Returns 3.74
trace(roundDecimal(myNumber, 3)); //Returns 3.743
trace(Math.round(myNumber)); //Returns 4

I hope this helps anyone looking for a similar solution.

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