ary-ptrn-rest-id-elision.js (1421B)
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/var-stmt.template 4 /*--- 5 description: Rest element following elision elements (`var` statement) 6 esid: sec-variable-statement-runtime-semantics-evaluation 7 features: [destructuring-binding] 8 flags: [generated] 9 info: | 10 VariableDeclaration : BindingPattern Initializer 11 12 1. Let rhs be the result of evaluating Initializer. 13 2. Let rval be GetValue(rhs). 14 3. ReturnIfAbrupt(rval). 15 4. Return the result of performing BindingInitialization for 16 BindingPattern passing rval and undefined as arguments. 17 18 13.3.3.6 Runtime Semantics: IteratorBindingInitialization 19 ArrayBindingPattern : [ Elisionopt BindingRestElement ] 20 1. If Elision is present, then 21 a. Let status be the result of performing 22 IteratorDestructuringAssignmentEvaluation of Elision with 23 iteratorRecord as the argument. 24 b. ReturnIfAbrupt(status). 25 2. Return the result of performing IteratorBindingInitialization for 26 BindingRestElement with iteratorRecord and environment as arguments. 27 ---*/ 28 var values = [1, 2, 3, 4, 5]; 29 30 var [ , , ...x] = values; 31 32 assert(Array.isArray(x)); 33 assert.sameValue(x.length, 3); 34 assert.sameValue(x[0], 3); 35 assert.sameValue(x[1], 4); 36 assert.sameValue(x[2], 5); 37 assert.notSameValue(x, values); 38 39 reportCompare(0, 0);