non-extensible-elements7.js

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// Test array.length setter on non-extensible/sealed/frozen arrays.

"use strict";

load(libdir + "asserts.js");

function testNonExtensible() {

    var a = [1, 2, 3, , ,];

    Object.preventExtensions(a);

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

        a.length = 10;

    assertEq(a.length, 10);

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

        a.length = 0;

    assertEq(a.length, 0);

    assertEq(a.toString(), "");

testNonExtensible();

function testSealed() {

    var a = [1, 2, 3, , ,];

    Object.seal(a);

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

        a.length = 10;

    assertEq(a.length, 10);

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

        assertThrowsInstanceOf(() => a.length = 0, TypeError);

    assertEq(a.length, 3);

    assertEq(a.toString(), "1,2,3");

testSealed();

function testFrozen() {

    var a = [1, 2, 3, , ,];

    Object.freeze(a);

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

        assertThrowsInstanceOf(() => a.length = 10, TypeError);

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

        assertThrowsInstanceOf(() => a.length = 0, TypeError);

    assertEq(a.length, 5);

    assertEq(a.toString(), "1,2,3,,");

testFrozen();