| // Copyright (c) 2020 Ecma International. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| |
| /*--- |
| esid: sec-assignment-operators-runtime-semantics-evaluation |
| description: Logical Or Assignment Operator |
| info: | |
| AssignmentExpression: |
| LeftHandSideExpression ||= AssignmentExpression |
| |
| 1. Let lref be the result of evaluating LeftHandSideExpression. |
| 2. Let lval be ? GetValue(lref). |
| 3. Let lbool be ! ToBoolean(lval). |
| 4. If lbool is true, return lval. |
| 5. Let rref be the result of evaluating AssignmentExpression. |
| 6. Let rval be ? GetValue(rref). |
| 7. Perform ? PutValue(lref, rval). |
| 8. Return rval. |
| features: [logical-assignment-operators] |
| |
| ---*/ |
| |
| var value = undefined; |
| assert.sameValue(value ||= 1, 1, "(value ||= 1) === 1; where value = undefined"); |
| |
| value = null; |
| assert.sameValue(value ||= 1, 1, "(value ||= 1) === 1; where value = null"); |
| |
| value = false; |
| assert.sameValue(value ||= 1, 1, "(value ||= 1) === 1; where value = false"); |
| |
| value = 0; |
| assert.sameValue(value ||= 1, 1, "(value ||= 1) === 1; where value = 0"); |
| |
| value = -0; |
| assert.sameValue(value ||= 1, 1, "(value ||= 1) === 1; where value = -0"); |
| |
| value = NaN; |
| assert.sameValue(value ||= 1, 1, "(value ||= 1) === 1; where value = NaN"); |
| |
| value = ""; |
| assert.sameValue(value ||= 1, 1, '(value ||= 1) === 1; where value = ""'); |
| |
| |
| |
| value = true; |
| assert.sameValue(value ||= 1, true, "(value ||= 1) === true; where value = true"); |
| |
| value = 2; |
| assert.sameValue(value ||= 1, 2, "(value ||= 1) === 2; where value = 2"); |
| |
| value = "test"; |
| assert.sameValue(value ||= 1, "test", '(value ||= 1) === "test"; where value = "test"'); |
| |
| var sym = Symbol(""); |
| value = sym; |
| assert.sameValue(value ||= 1, sym, "(value ||= 1) === Symbol(); where value = Symbol()"); |
| |
| var obj = {}; |
| value = obj; |
| assert.sameValue(value ||= 1, obj, "(value ||= 1) === {}; where value = {}"); |