obj-rest-symbol-val.js (1351B)
1 // This file was procedurally generated from the following sources: 2 // - src/dstr-assignment/obj-rest-symbol-val.case 3 // - src/dstr-assignment/default/for-of.template 4 /*--- 5 description: RestBindingInitialization creates a new object if lhs is a Symbol (For..of statement) 6 esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation 7 features: [Symbol, object-rest, destructuring-binding] 8 flags: [generated] 9 info: | 10 IterationStatement : 11 for ( LeftHandSideExpression of AssignmentExpression ) Statement 12 13 1. Let keyResult be the result of performing ? ForIn/OfHeadEvaluation(« », 14 AssignmentExpression, iterate). 15 2. Return ? ForIn/OfBodyEvaluation(LeftHandSideExpression, Statement, 16 keyResult, assignment, labelSet). 17 18 13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation 19 20 [...] 21 4. If destructuring is true and if lhsKind is assignment, then 22 a. Assert: lhs is a LeftHandSideExpression. 23 b. Let assignmentPattern be the parse of the source text corresponding to 24 lhs using AssignmentPattern as the goal symbol. 25 [...] 26 ---*/ 27 var rest; 28 29 30 var counter = 0; 31 32 for ({...rest} of [Symbol("foo")]) { 33 assert.notSameValue(rest, undefined); 34 assert.notSameValue(rest, null); 35 assert(rest instanceof Object); 36 37 counter += 1; 38 } 39 40 assert.sameValue(counter, 1); 41 42 reportCompare(0, 0);