lazy-methods-throw-eagerly-on-non-iterator.js

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

//

//

/*---

esid: pending

description: Lazy %Iterator.prototype% methods don't throw when called with non-objects.

info: >

  Iterator Helpers proposal 1.1.1

features: [iterator-helpers]

---*/

const methods = [

  iter => Iterator.prototype.map.bind(iter, x => x),

  iter => Iterator.prototype.filter.bind(iter, x => x),

  iter => Iterator.prototype.take.bind(iter, 1),

  iter => Iterator.prototype.drop.bind(iter, 0),

  iter => Iterator.prototype.flatMap.bind(iter, x => [x]),

];

for (const method of methods) {

  assertThrowsInstanceOf(method(undefined), TypeError);

  assertThrowsInstanceOf(method(null), TypeError);

  assertThrowsInstanceOf(method(0), TypeError);

  assertThrowsInstanceOf(method(false), TypeError);

  assertThrowsInstanceOf(method(''), TypeError);

  assertThrowsInstanceOf(method(Symbol('')), TypeError);

  // No error here.

  method({});

  method([]);

if (typeof reportCompare == 'function')

  reportCompare(0, 0);