Really simple number methods ☺

number.js

define(function (){
    'use strict';

    var math = Math,
        abs  = math.abs,
        max  = math.max,
        min  = math.min;

    return {
        absMax: function (a, b){
            return abs(a) > abs(b) ? a : b;
        },

        absMin: function (a, b){
            return abs(a) < abs(b) ? a : b;
        },

        clip: function (n, low, high){
            return max(low, min(high, n));
        },

        sign: function (n){
            return n > 0 ? 1 : (n < 0 ? -1 : (n === 0 ? 0 : NaN));
        }
    };
});