// Copyright (C) 2023 Michael Ficarra. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-iteratorprototype.flatMap
description: >
  Iterator.prototype.flatMap falls back to treating mapper return values as iterators if the Symbol.iterator property is null/undefined
info: |
  %Iterator.prototype%.flatMap ( mapper )

  5.b.vi. Let innerIterator be Completion(GetIteratorFlattenable(mapped)).

includes: [compareArray.js]
features: [iterator-helpers]
flags: []
---*/

function* g() {
  yield 0;
}

function* h() {
  yield 0;
  yield 1;
  yield 2;
}

let iter = g().flatMap(v => {
  let n = h();
  return {
    [Symbol.iterator]: 0,
    next: () => n.next(),
  };
});

assert.throws(TypeError, function () {
  iter.next();
});

iter = g().flatMap(v => {
  let n = h();
  return {
    [Symbol.iterator]: null,
    next: () => n.next(),
  };
});

assert.compareArray(Array.from(iter), [0, 1, 2]);

iter = g().flatMap(v => {
  let n = h();
  return {
    [Symbol.iterator]: undefined,
    next: () => n.next(),
  };
});

assert.compareArray(Array.from(iter), [0, 1, 2]);

reportCompare(0, 0);
