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author | Matt A. Tobin <mattatobin@localhost.localdomain> | 2018-02-02 04:16:08 -0500 |
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committer | Matt A. Tobin <mattatobin@localhost.localdomain> | 2018-02-02 04:16:08 -0500 |
commit | 5f8de423f190bbb79a62f804151bc24824fa32d8 (patch) | |
tree | 10027f336435511475e392454359edea8e25895d /js/src/tests/ecma_6/Generators/delegating-yield-5.js | |
parent | 49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff) | |
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Add m-esr52 at 52.6.0
Diffstat (limited to 'js/src/tests/ecma_6/Generators/delegating-yield-5.js')
-rw-r--r-- | js/src/tests/ecma_6/Generators/delegating-yield-5.js | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/js/src/tests/ecma_6/Generators/delegating-yield-5.js b/js/src/tests/ecma_6/Generators/delegating-yield-5.js new file mode 100644 index 000000000..f4376743b --- /dev/null +++ b/js/src/tests/ecma_6/Generators/delegating-yield-5.js @@ -0,0 +1,37 @@ +// 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); |