array-iteration.js (1353B)
1 // This file was procedurally generated from the following sources: 2 // - src/dstr-assignment/array-iteration.case 3 // - src/dstr-assignment/default/for-of.template 4 /*--- 5 description: Value iteration only proceeds for the number of elements in the ArrayAssignmentPattern. (For..of statement) 6 esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation 7 features: [generators, 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 count = 0; 28 var g = function*() { 29 count += 1; 30 yield; 31 count += 1; 32 yield; 33 count += 1; 34 } 35 36 var counter = 0; 37 38 for ([,,] of [g()]) { 39 assert.sameValue(count, 2); 40 counter += 1; 41 } 42 43 assert.sameValue(counter, 1); 44 45 reportCompare(0, 0);