iterator-proto-1.js

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// All iterators of the same collection type share their immediate prototype.

// Those prototype objects in turn inherit directly from %IteratorPrototype%.

load(libdir + "iteration.js");

// Get %IteratorPrototype%.

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

function test(obj0, obj1) {

    var iter0 = obj0[Symbol.iterator](), iter1 = obj1[Symbol.iterator]();

    var proto = Object.getPrototypeOf(iter0);

    assertEq(Object.getPrototypeOf(iter1), proto);

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

test([], [1]);

test(new Map(), new Map([[1, 1]]));

test(new Set(), new Set([1]));