array-iterator-surfaces-2.js

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// Superficial tests for iterators created by Array.prototype.iterator

load(libdir + "iteration.js");

var proto = Object.getPrototypeOf([][Symbol.iterator]());

var iterProto = Object.getPrototypeOf(proto);

proto = Object.getPrototypeOf([].keys());

assertEq(Object.getPrototypeOf(proto), iterProto);

proto = Object.getPrototypeOf([].entries());

assertEq(Object.getPrototypeOf(proto), iterProto);

function check(it) {

    assertEq(typeof it, 'object');

    assertEq(Object.getPrototypeOf(it), proto);

    assertEq(Object.getOwnPropertyNames(it).length, 0);

    assertEq(it[Symbol.iterator](), it);

    // for-in enumerates the iterator's properties.

    it.x = 0;

    var s = '';

    for (var p in it)

        s += p + '.';

    assertEq(s, 'x.');

check([][Symbol.iterator]());

check(Array.prototype[Symbol.iterator].call({}));

check([].keys());

check(Array.prototype.keys.call({}));

check([].entries());

check(Array.prototype.entries.call({}));