obj-ptrn-prop-id-init-skipped.js (1518B)
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/let-stmt.template 4 /*--- 5 description: Destructuring initializer is not evaluated when value is not `undefined` (`let` statement) 6 esid: sec-let-and-const-declarations-runtime-semantics-evaluation 7 features: [destructuring-binding] 8 flags: [generated] 9 info: | 10 LexicalBinding : BindingPattern Initializer 11 12 1. Let rhs be the result of evaluating Initializer. 13 2. Let value be GetValue(rhs). 14 3. ReturnIfAbrupt(value). 15 4. Let env be the running execution context's LexicalEnvironment. 16 5. Return the result of performing BindingInitialization for BindingPattern 17 using value and env as the arguments. 18 19 13.3.3.7 Runtime Semantics: KeyedBindingInitialization 20 21 BindingElement : BindingPattern Initializeropt 22 23 [...] 24 3. If Initializer is present and v is undefined, then 25 [...] 26 ---*/ 27 var initCount = 0; 28 function counter() { 29 initCount += 1; 30 } 31 32 let { s: t = counter(), u: v = counter(), w: x = counter(), y: z = counter() } = { s: null, u: 0, w: false, y: '' }; 33 34 assert.sameValue(t, null); 35 assert.sameValue(v, 0); 36 assert.sameValue(x, false); 37 assert.sameValue(z, ''); 38 assert.sameValue(initCount, 0); 39 40 assert.throws(ReferenceError, function() { 41 s; 42 }); 43 assert.throws(ReferenceError, function() { 44 u; 45 }); 46 assert.throws(ReferenceError, function() { 47 w; 48 }); 49 assert.throws(ReferenceError, function() { 50 y; 51 }); 52 53 reportCompare(0, 0);