underscore mixins

underscore-mixins.js

_.mixin({
    // from underscore's examples [http://underscorejs.org/#mixin](http://underscorejs.org/#mixin)
    capitalize: function(string) {
        return string.charAt(0).toUpperCase() + string.substring(1).toLowerCase();
    },
    
    ensureApi: function(obj, api) {},
    
    /**
     *  add sep betwen 3 numbers:
     *  ex: formatNumber(1000000, ',') return 1,000,000 
     */ 
    formatNumber: function(nbr, sep) {
        nbr.toString().replace(/\B(?=(\d{3})+(?!\d))/g, sep);
    }
    //  return an number formated with '0' to match `length` length
    //  default length : 3
    //  _.padLeft(2) === '002';
    padLeft: function(number, length) {
        length = (length || 3);
        number =  number.toString();
        if (number.length < length) {
            return _.padLeft.call(_, '0' + number, length);
        }
        return number;
    },

    //  create an array populated with values from `low` to `high`
    arrayRange: function(low, high) {
        var arr = [];
        while (low <= high) {
            arr.push(low);
            low += 1;
        }
        return arr;
    },

    constrain: function(value, min, max) {
        if (value > max) { value = max; }
        if (value < min) { value = min; }
        return value;
    }
});