var-obj-ptrn-prop-id-init-skipped.js (2077B)
1 // This file was procedurally generated from the following sources: 2 // - src/dstr-binding/obj-ptrn-prop-id-init-skipped.case 3 // - src/dstr-binding/default/for-of-var.template 4 /*--- 5 description: Destructuring initializer is not evaluated when value is not `undefined` (for-of statement) 6 esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation 7 features: [destructuring-binding] 8 flags: [generated] 9 info: | 10 IterationStatement : 11 for ( var ForBinding of AssignmentExpression ) Statement 12 13 [...] 14 3. Return ForIn/OfBodyEvaluation(ForBinding, Statement, keyResult, 15 varBinding, labelSet). 16 17 13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation 18 19 [...] 20 3. Let destructuring be IsDestructuring of lhs. 21 [...] 22 5. Repeat 23 [...] 24 h. If destructuring is false, then 25 [...] 26 i. Else 27 i. If lhsKind is assignment, then 28 [...] 29 ii. Else if lhsKind is varBinding, then 30 1. Assert: lhs is a ForBinding. 31 2. Let status be the result of performing BindingInitialization 32 for lhs passing nextValue and undefined as the arguments. 33 [...] 34 35 13.3.3.7 Runtime Semantics: KeyedBindingInitialization 36 37 BindingElement : BindingPattern Initializeropt 38 39 [...] 40 3. If Initializer is present and v is undefined, then 41 [...] 42 ---*/ 43 var initCount = 0; 44 function counter() { 45 initCount += 1; 46 } 47 48 var iterCount = 0; 49 50 for (var { s: t = counter(), u: v = counter(), w: x = counter(), y: z = counter() } of [{ s: null, u: 0, w: false, y: '' }]) { 51 assert.sameValue(t, null); 52 assert.sameValue(v, 0); 53 assert.sameValue(x, false); 54 assert.sameValue(z, ''); 55 assert.sameValue(initCount, 0); 56 57 assert.throws(ReferenceError, function() { 58 s; 59 }); 60 assert.throws(ReferenceError, function() { 61 u; 62 }); 63 assert.throws(ReferenceError, function() { 64 w; 65 }); 66 assert.throws(ReferenceError, function() { 67 y; 68 }); 69 70 iterCount += 1; 71 } 72 73 assert.sameValue(iterCount, 1, 'Iteration occurred as expected'); 74 75 reportCompare(0, 0);