modify-return.js - mozsearch

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

const iter = {

  next: () => ({ done: false, value: 0 }),

  return: (value = "old return") => ({ done: true, value }),

};

const wrap = Iterator.from(iter);

let {done, value} = wrap.return("return argument ignored");

assertEq(done, true);

assertEq(value, "old return");

iter.return = () => { throw new Error(); };

assertThrowsInstanceOf(wrap.return, Error);

iter.return = null;

let nullResult = wrap.return("return argument ignored");

assertEq(nullResult.done, true);

assertEq(nullResult.value, undefined);

if (typeof reportCompare === 'function')

  reportCompare(0, 0);