frozen-dense-array.js

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/*

 * Any copyright is dedicated to the Public Domain.

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

 * Author: Emilio Cobos Álvarez <ecoal95@gmail.com>

*/

var BUGNUMBER = 1310744;

var summary = "Dense array properties shouldn't be modified when they're frozen";

print(BUGNUMBER + ": " + summary);

var a = Object.freeze([4, 5, 1]);

function assertArrayIsExpected() {

  assertEq(a.length, 3);

  assertEq(a[0], 4);

  assertEq(a[1], 5);

  assertEq(a[2], 1);

assertThrowsInstanceOf(() => a.reverse(), TypeError);

assertThrowsInstanceOf(() => a.shift(), TypeError);

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

assertThrowsInstanceOf(() => a.sort(function() {}), TypeError);

assertThrowsInstanceOf(() => a.pop(), TypeError);

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

assertThrowsInstanceOf(() => a.splice(0, 1, 1), TypeError);

assertThrowsInstanceOf(() => a.push("foo"), TypeError);

assertThrowsInstanceOf(() => { "use strict"; a.length = 5; }, TypeError);

assertThrowsInstanceOf(() => { "use strict"; a[2] = "foo"; }, TypeError);

assertThrowsInstanceOf(() => { "use strict"; delete a[0]; }, TypeError);

assertThrowsInstanceOf(() => a.splice(Math.a), TypeError);

// Shouldn't throw, since this is not strict mode, but shouldn't change the

// value of the property.

a.length = 5;

a[2] = "foo";

assertEq(delete a[0], false);

assertArrayIsExpected();

if (typeof reportCompare === "function")

  reportCompare(true, true);