array-iterator-generic.js

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// Array.prototype.iterator is generic.

// That is, it can be applied to arraylike objects and strings, not just arrays.

load(libdir + "asserts.js");

load(libdir + "iteration.js");

function test(obj) {

    var it = Array.prototype[Symbol.iterator].call(obj);

    var ki = Array.prototype.keys.call(obj);

    var ei = Array.prototype.entries.call(obj);

    for (var i = 0; i < (obj.length >>> 0); i++) {

        assertIteratorNext(it, obj[i]);

        assertIteratorNext(ki, i);

        assertIteratorNext(ei, [i, obj[i]]);

    assertIteratorDone(it, undefined);

    assertIteratorDone(ki, undefined);

    assertIteratorDone(ei, undefined);

test({length: 0});

test({length: 0, 0: 'x', 1: 'y'});

test({length: 2, 0: 'x', 1: 'y'});

test(Object.create(['x', 'y', 'z']));

test(Object.create({length: 2, 0: 'x', 1: 'y'}));

test("");

test("ponies");

// Perverse length values.

test({length: "011", 9: 9, 10: 10, 11: 11});

test({length: -0});

test({length: 2.7, 0: 0, 1: 1, 2: 2});

test({length: {valueOf: function () { return 3; }}, 0: 0, 1: 1, 2: 2});