ary-ptrn-elem-ary-elision-init.js (1472B)
1 // This file was procedurally generated from the following sources: 2 // - src/dstr-binding/ary-ptrn-elem-ary-elision-init.case 3 // - src/dstr-binding/default/const-stmt.template 4 /*--- 5 description: BindingElement with array binding pattern and initializer is used (`const` statement) 6 esid: sec-let-and-const-declarations-runtime-semantics-evaluation 7 features: [generators, 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 13.3.3.6 Runtime Semantics: IteratorBindingInitialization 20 21 BindingElement : BindingPatternInitializer opt 22 23 [...] 24 2. If iteratorRecord.[[done]] is true, let v be undefined. 25 3. If Initializer is present and v is undefined, then 26 a. Let defaultValue be the result of evaluating Initializer. 27 b. Let v be ? GetValue(defaultValue). 28 4. Return the result of performing BindingInitialization of BindingPattern 29 with v and environment as the arguments. 30 31 ---*/ 32 var first = 0; 33 var second = 0; 34 function* g() { 35 first += 1; 36 yield; 37 second += 1; 38 }; 39 40 const [[,] = g()] = []; 41 42 assert.sameValue(first, 1); 43 assert.sameValue(second, 0); 44 45 reportCompare(0, 0);