ary-ptrn-rest-id-elision.js (1499B)
1 // This file was procedurally generated from the following sources: 2 // - src/dstr-binding/ary-ptrn-rest-id-elision.case 3 // - src/dstr-binding/default/const-stmt.template 4 /*--- 5 description: Rest element following elision elements (`const` 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 13.3.3.6 Runtime Semantics: IteratorBindingInitialization 20 ArrayBindingPattern : [ Elisionopt BindingRestElement ] 21 1. If Elision is present, then 22 a. Let status be the result of performing 23 IteratorDestructuringAssignmentEvaluation of Elision with 24 iteratorRecord as the argument. 25 b. ReturnIfAbrupt(status). 26 2. Return the result of performing IteratorBindingInitialization for 27 BindingRestElement with iteratorRecord and environment as arguments. 28 ---*/ 29 var values = [1, 2, 3, 4, 5]; 30 31 const [ , , ...x] = values; 32 33 assert(Array.isArray(x)); 34 assert.sameValue(x.length, 3); 35 assert.sameValue(x[0], 3); 36 assert.sameValue(x[1], 4); 37 assert.sameValue(x[2], 5); 38 assert.notSameValue(x, values); 39 40 reportCompare(0, 0);