array-rest-nested-obj-undefined.js (1187B)
1 // This file was procedurally generated from the following sources: 2 // - src/dstr-assignment/array-rest-nested-obj-undefined.case 3 // - src/dstr-assignment/default/assignment-expr.template 4 /*--- 5 description: When DestructuringAssignmentTarget is an obect literal and the iterable is emits no values, an empty array should be used as the value of the nested DestructuringAssignment. (AssignmentExpression) 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 var x = null; 19 // Use the the top-level lexical scope for 'length' to provide compatibility with browsers 20 // where length and name are properties of WindowProxy 21 let length; 22 23 var result; 24 var vals = []; 25 26 result = [...{ 0: x, length }] = vals; 27 28 assert.sameValue(x, undefined); 29 assert.sameValue(length, 0); 30 31 assert.sameValue(result, vals); 32 33 reportCompare(0, 0);