array-iterator-proxy.js

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// An array iterator for a proxy calls the traps in a predictable order.

load(libdir + "asserts.js");

load(libdir + "iteration.js");

var s = '';

var handler = {

    get: function (recipient, name) {

        if (name == 'length') {

            s += 'L';

            return 2;

        } else {

            s += name;

            return name;

};

var it = Array.prototype[Symbol.iterator].call(new Proxy([0, 1], handler));

assertIteratorNext(it, "0");

s += ' ';

assertIteratorNext(it, "1");

s += ' ';

assertIteratorDone(it, undefined);

assertEq(s, "L0 L1 L");

s = '';

var ki = Array.prototype.keys.call(new Proxy([0, 1], handler));

assertIteratorNext(ki, 0);

s += ' ';

assertIteratorNext(ki, 1);

s += ' ';

assertIteratorDone(ki, undefined);

assertEq(s, "L L L");

s = '';

var ei = Array.prototype.entries.call(new Proxy([0, 1], handler));

assertIteratorNext(ei, [0, "0"]);

s += ' ';

assertIteratorNext(ei, [1, "1"]);

s += ' ';

assertIteratorDone(ei, undefined);

assertEq(s, "L0 L1 L");