semantics-04.js - mozsearch

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// Giving an Array an own .iterator property affects for-of.

load(libdir + "asserts.js");

load(libdir + "iteration.js");

var a = [];

a[Symbol.iterator] = function* () {

    yield 'o';

    yield 'k';

};

var s = '';

for (var v of a)

    s += v;

assertEq(s, 'ok');

a[Symbol.iterator] = undefined;

assertThrowsInstanceOf(function () { for (var v of a) ; }, TypeError);