wrap-return-closes-iterator.js

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// |reftest| skip-if(!this.hasOwnProperty('Iterator')) -- Iterator is not enabled unconditionally

class Iter {

  next() {

    if (this.closed)

      return { done: true, value: undefined };

    return { done: false, value: 0 };

  return(value) {

    assertEq(arguments.length, 0);

    this.closed = true;

    return { done: true, value: 42 };

const iter = new Iter();

const wrap = Iterator.from(iter);

assertEq(iter.closed, undefined);

let result = wrap.next();

assertEq(result.done, false);

assertEq(result.value, 0);

result = wrap.return(1);

assertEq(result.done, true);

assertEq(result.value, 42);

assertEq(iter.closed, true);

result = wrap.next();

assertEq(result.done, true);

assertEq(result.value, undefined);

if (typeof reportCompare === 'function')

  reportCompare(0, 0);