Round up a number to the nearest tens

roundup10s.js

Math.roundUp10s = (function(m) {
    var ln10 = (m.LN10 || m.log(10));
    // (C) Giorgio Arata - DO WHAT YOU WANT LICENSE
    return function roundUp10s(value) {
        var length, power, isNeg;
        if (isNeg = (value < 0))
            value = Math.abs(value);
        length = m.floor((m.log(value) / ln10) + 1.0) - 1;
        power = m.pow(10, length);
        return (isNeg ? -1 : 1) * m.ceil((value) / power) * power;
    };
})(Math);