Round Numbers to Reader Friendly format

ReaderFriendlyNumbers.js

function abbrNum(number, decPlaces){
    //http://stackoverflow.com/questions/2685911/is-there-a-way-to-round-numbers-into-a-reader-friendly-format-e-g-1-1k
    // 2 decimal places => 100, 3 => 1000, etc
    decPlaces = Math.pow(10,decPlaces);

    // Enumerate number abbreviations
    var abbrev = [ "k", "m", "b", "t" ];

    // Go through the array backwards, so we do the largest first
    for (var i=abbrev.length-1; i>=0; i--) {

        // Convert array index to "1000", "1000000", etc
        var size = Math.pow(10,(i+1)*3);

        // If the number is bigger or equal do the abbreviation
        if(size <= number) {
            // Here, we multiply by decPlaces, round, and then divide by decPlaces.
            // This gives us nice rounding to a particular decimal place.
            number = Math.round(number*decPlaces/size)/decPlaces;

            // Handle special case where we round up to the next abbreviation
            if((number == 1000) && (i < abbrev.length - 1)) {
                number = 1;
                i++;
            }

            // Add the letter for the abbreviation
            number += abbrev[i];

            // We are done... stop
            break;
        }
    }

    return number;
}