markhowellsmead

if (!Array.prototype.find) {
        Array.prototype.find = function(predicate) {
            if (this == null) {
                throw new TypeError('Array.prototype.find called on null or undefined');
            }
            if (typeof predicate !== 'function') {
                throw new TypeError('predicate must be a function');
            }
            var list = Object(this);
            var length = list.length >>> 0;