computed-reference-null-or-undefined.js (1420B)
1 // Copyright (C) 2024 Sony Interactive Entertainment Inc. All rights reserved. 2 // This code is governed by the BSD license found in the LICENSE file. 3 4 /*--- 5 esid: sec-evaluate-property-access-with-expression-key 6 description: When getting the value of o[p], ToObject(o) precedes ToPropertyKey(p). 7 info: | 8 13.3.3 EvaluatePropertyAccessWithExpressionKey ( baseValue, expression, strict ) 9 1. Let _propertyNameReference_ be ? Evaluation of _expression_. 10 2. Let _propertyNameValue_ be ? GetValue(_propertyNameReference_). 11 ... 12 4. Return the Reference Record { [[Base]]: _baseValue_, [[ReferencedName]]: _propertyNameValue_, [[Strict]]: _strict_, [[ThisValue]]: ~empty~ }. 13 14 6.2.5.5 GetValue ( V ) 15 1. If V is not a Reference Record, return V. 16 ... 17 3. If IsPropertyReference(V) is true, then 18 a. Let baseObj be ? ToObject(V.[[Base]]). 19 ... 20 c. If V.[[ReferencedName]] is neither a String nor a Symbol, then 21 i. Let referencedName be ? ToPropertyKey(V.[[ReferencedName]]). 22 ---*/ 23 24 assert.throws(TypeError, function() { 25 var base = null; 26 var prop = { 27 toString: function() { 28 throw new Test262Error("property key evaluated"); 29 } 30 }; 31 32 base[prop]; 33 }); 34 35 assert.throws(TypeError, function() { 36 var base = undefined; 37 var prop = { 38 toString: function() { 39 throw new Test262Error("property key evaluated"); 40 } 41 }; 42 43 base[prop]; 44 }); 45 46 reportCompare(0, 0);