polyfill-service/polyfills/_ArrayIterator/polyfill.js

A polyfill combinator

// A modification of https://github.com/medikoo/es6-iterator
// Copyright (C) 2013-2015 Mariusz Nowak (www.medikoo.com)

var ArrayIterator = (function() { // eslint-disable-line no-unused-vars

	var ArrayIterator = function(arr, kind) {
		if (!(this instanceof ArrayIterator)) return new ArrayIterator(arr, kind);
		Iterator.call(this, arr);
		if (!kind) kind = 'value';
		else if (String.prototype.contains.call(kind, 'key+value')) kind = 'key+value';
		else if (String.prototype.contains.call(kind, 'key')) kind = 'key';
		else kind = 'value';
		Object.defineProperty(this, '__kind__', {
			value: kind,
			configurable: false,
			enumerable: false,
			writable: false
		});
	};
	if (Object.setPrototypeOf) Object.setPrototypeOf(ArrayIterator, Iterator.prototype);

	ArrayIterator.prototype = Object.create(Iterator.prototype, {
		constructor: {
			value: ArrayIterator,
			configurable: true,
			enumerable: false,
			writable: true
		},
		_resolve: {
			value: function(i) {
				if (this.__kind__ === 'value') return this.__list__[i];
				if (this.__kind__ === 'key+value') return [i, this.__list__[i]];
				return i;
			},
			configurable: true,
			enumerable: false,
			writable: true
		},
		toString: {
			value: function() {
				return '[object Array Iterator]';
			},
			configurable: true,
			enumerable: false,
			writable: true
		}
	});

	return ArrayIterator;
}());