prototypes.js

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if (!Array.prototype.every) {
    Array.prototype.every = function(callback) {
        var len = this.length, i;

        for (i = 0; i < len; i++) {
            if (i in this && !callback.call(null, this[i], i)) {
                return false;
            }
        }

        return true;
    };
}

if (!Array.prototype.forEach) {
    Array.prototype.forEach = function(callback) {
        var len = this.length, i;

        for (i = 0; i < len; i++) {
            if (i in this) {
                callback.call(null, this[i], i);
            }
        }
    };
}

if (!String.prototype.ltrim) {
    String.prototype.ltrim = function(str) {
        if (this.indexOf(str) === 0) {
            return this.substring(str.length);
        } else {
            return this;
        }
    };
}