Source code

Revision control

Copy as Markdown

Other Tools

// 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");