isArray.js - mozsearch

Enable keyboard shortcuts

/* Any copyright is dedicated to the Public Domain.

 * http://creativecommons.org/licenses/publicdomain/ */

var global = this;

var otherGlobal = newGlobal();

var thisGlobal = () => global;

var alternateGlobals = (function(i) {

    return () => (i++ % 2) === 0 ? global : otherGlobal;

})(0);

function performTests(pickGlobal)

    // Base case.

    assertEq(Array.isArray([]), true);

    // Simple case: proxy to an array.

    var proxy = new (pickGlobal()).Proxy([], {});

    assertEq(Array.isArray(proxy), true);

    // Recursive proxy ultimately terminating in an array.

    for (var i = 0; i < 10; i++) {

        proxy = new (pickGlobal()).Proxy(proxy, {});

        assertEq(Array.isArray(proxy), true);

    // Revocable proxy to an array.

    var revocable = (pickGlobal()).Proxy.revocable([], {});

    proxy = revocable.proxy;

    assertEq(Array.isArray(proxy), true);

    // Recursive proxy ultimately terminating in a revocable proxy to an array.

    for (var i = 0; i < 10; i++) {

        proxy = new (pickGlobal()).Proxy(proxy, {});

        assertEq(Array.isArray(proxy), true);

    // Revoked proxy to (formerly) an array.

    revocable.revoke();

    assertThrowsInstanceOf(() => Array.isArray(revocable.proxy), TypeError);

    // Recursive proxy ultimately terminating in a revoked proxy to an array.

    assertThrowsInstanceOf(() => Array.isArray(proxy), TypeError);

performTests(thisGlobal);

performTests(alternateGlobals);

function crossGlobalTest()

    var array = new otherGlobal.Array();

    // Array from another global.

    assertEq(Array.isArray(array), true);

    // Proxy to an array from another global.

    assertEq(Array.isArray(new Proxy(array, {})), true);

    // Other-global proxy to an array from that selfsame global.

    assertEq(Array.isArray(new otherGlobal.Proxy(array, {})), true);

crossGlobalTest();

if (typeof reportCompare === "function")

    reportCompare(true, true);