delegating-yield-5.js

Enable keyboard shortcuts

// Test that a deep yield* chain re-yields received results without

// re-boxing.

function results(results) {

    var i = 0;

    function next() {

        return results[i++];

    var iter = { next: next };

    var ret = {};

    ret[Symbol.iterator] = function () { return iter; }

    return ret;

function* yield_results(expected, n) {

    return yield* n ? yield_results(expected, n - 1) : results(expected);

function collect_results(iterable) {

    var ret = [];

    var result;

    var iter = iterable[Symbol.iterator]();

    do {

        result = iter.next();

        ret.push(result);

    } while (!result.done);

    return ret;

// We have to put a full result for the end, because the return will re-box.

var expected = [{value: 1}, {value: 34, done: true}];

assertDeepEq(expected, collect_results(results(expected)));

assertDeepEq(expected, collect_results(yield_results(expected, 20)));

if (typeof reportCompare == "function")

    reportCompare(true, true);