lazy-methods-from-other-global.js

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// |reftest| skip-if(!this.hasOwnProperty('Iterator'))

const otherIteratorProto = newGlobal({newCompartment: true}).Iterator.prototype;

const methods = [

  ["map", x => x],

  ["filter", x => true],

  ["take", Infinity],

  ["drop", 0],

  ["flatMap", x => [x]],

];

// Use the lazy Iterator methods from another global on an iterator from this global.

for (const [method, arg] of methods) {

  const iterator = [1, 2, 3].values();

  const helper = otherIteratorProto[method].call(iterator, arg);

  for (const expected of [1, 2, 3]) {

    const {done, value} = helper.next();

    assertEq(done, false);

    assertEq(Array.isArray(value) ? value[1] : value, expected);

  const {done, value} = helper.next();

  assertEq(done, true);

  assertEq(value, undefined);

if (typeof reportCompare === 'function')

  reportCompare(0, 0);