Javascript Number roundToPrec(precision)

.pragma library/*  w w  w . j a  va  2  s .c o  m*/

// roundToPrec is different from toFixed as it returns a Number
// instead of a String thus removing trailing zeros int the fractional part...
Number.prototype.roundToPrec = function(precision)
{
    var power = Math.pow(10, precision || 0);
    return Math.round(this * power) / power;
}