1 // Copyright 2016 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 var limit = 10000; 6 7 function testStringWrapper(string) { 8 assertEquals('a', string[0]); 9 assertEquals('b', string[1]); 10 assertEquals('c', string[2]); 11 } 12 13 (function testFastStringWrapperGrow() { 14 var string = new String("abc"); 15 for (var i = 0; i < limit; i += 2) { 16 string[i] = {}; 17 } 18 testStringWrapper(string); 19 20 for (var i = limit; i > 0; i -= 2) { 21 delete string[i]; 22 } 23 testStringWrapper(string); 24 })(); 25 26 (function testSlowStringWrapperGrow() { 27 var string = new String("abc"); 28 // Force Slow String Wrapper Elements Kind 29 string[limit] = limit; 30 for (var i = 0; i < limit; i += 2) { 31 string[i] = {}; 32 } 33 testStringWrapper(string); 34 assertEquals(limit, string[limit]); 35 36 for (var i = limit; i > 0; i -= 2) { 37 delete string[i]; 38 } 39 testStringWrapper(string); 40 assertEquals(undefined, string[limit]); 41 })(); 42 43 44 (function testReconfigureStringWrapperElements() { 45 var s = new String('abc'); 46 // Can't reconfigure string contents. 47 assertThrows(() => Object.defineProperty(s, '1', {value: "value"}), TypeError); 48 49 // Configure a property outside the string range 50 var value = 'v1'; 51 Object.defineProperty(s, '3', { 52 get: () => {return value}, 53 configurable:true 54 }); 55 assertEquals('v1', s[3]); 56 value = 'v2'; 57 assertEquals('v2', s[3]); 58 59 Object.defineProperty(s, '3', {value: 'v3', configurable: false}); 60 assertEquals('v3', s[3]); 61 assertThrows(() => Object.defineProperty(s, '3', {value:2}), TypeError); 62 })(); 63
