string-iterator-generic.js

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// String.prototype.iterator is generic.

load(libdir + "asserts.js");

load(libdir + "iteration.js");

load(libdir + "string.js");

function test(obj) {

    var it = String.prototype[Symbol.iterator].call(obj);

    var s = String(obj);

    for (var i = 0, length = s.length; i < length;) {

        var r = s[i++];

        if (isHighSurrogate(r) && i < length && isLowSurrogate(s[i])) {

            r += s[i++];

        assertIteratorNext(it, r);

    assertIteratorDone(it, undefined);

test({toString: () => ""});

test({toString: () => "xyz"});

test({toString: () => "\ud808\udf45"});

test({valueOf: () => ""});

test({valueOf: () => "xyz"});

test({valueOf: () => "\ud808\udf45"});