semantics-03.js - mozsearch

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// Replacing Array.prototype.iterator with a generator affects for-of behavior.

load(libdir + "iteration.js");

Array.prototype[Symbol.iterator] = function* () {

    for (var i = this.length; --i >= 0; )

        yield this[i];

};

var s = '';

for (var v of ['a', 'b', 'c', 'd'])

    s += v;

assertEq(s, 'dcba');