obj-rest-descriptors.js (1690B)
1 // This file was procedurally generated from the following sources: 2 // - src/dstr-assignment/obj-rest-descriptors.case 3 // - src/dstr-assignment/default/for-of.template 4 /*--- 5 description: Object created from rest deconstruction doesn't copy source object property descriptors. (For..of statement) 6 esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation 7 features: [object-rest, destructuring-binding] 8 flags: [generated] 9 includes: [propertyHelper.js] 10 info: | 11 IterationStatement : 12 for ( LeftHandSideExpression of AssignmentExpression ) Statement 13 14 1. Let keyResult be the result of performing ? ForIn/OfHeadEvaluation(« », 15 AssignmentExpression, iterate). 16 2. Return ? ForIn/OfBodyEvaluation(LeftHandSideExpression, Statement, 17 keyResult, assignment, labelSet). 18 19 13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation 20 21 [...] 22 4. If destructuring is true and if lhsKind is assignment, then 23 a. Assert: lhs is a LeftHandSideExpression. 24 b. Let assignmentPattern be the parse of the source text corresponding to 25 lhs using AssignmentPattern as the goal symbol. 26 [...] 27 ---*/ 28 var rest; 29 var obj = {}; 30 Object.defineProperty(obj, "a", { value: 3, configurable: false, enumerable: true }); 31 Object.defineProperty(obj, "b", { value: 4, writable: false, enumerable: true }); 32 33 var counter = 0; 34 35 for ({...rest} of [obj]) { 36 verifyProperty(rest, "a", { 37 enumerable: true, 38 writable: true, 39 configurable: true, 40 value: 3 41 }); 42 43 verifyProperty(rest, "b", { 44 enumerable: true, 45 writable: true, 46 configurable: true, 47 value: 4 48 }); 49 50 counter += 1; 51 } 52 53 assert.sameValue(counter, 1); 54 55 reportCompare(0, 0);