dflt-ary-ptrn-rest-id.js (1892B)
1 // This file was procedurally generated from the following sources: 2 // - src/dstr-binding/ary-ptrn-rest-id.case 3 // - src/dstr-binding/default/arrow-function-dflt.template 4 /*--- 5 description: Lone rest element (arrow function expression (default parameter)) 6 esid: sec-arrow-function-definitions-runtime-semantics-evaluation 7 features: [destructuring-binding, default-parameters] 8 flags: [generated] 9 info: | 10 ArrowFunction : ArrowParameters => ConciseBody 11 12 [...] 13 4. Let closure be FunctionCreate(Arrow, parameters, ConciseBody, scope, strict). 14 [...] 15 16 9.2.1 [[Call]] ( thisArgument, argumentsList) 17 18 [...] 19 7. Let result be OrdinaryCallEvaluateBody(F, argumentsList). 20 [...] 21 22 9.2.1.3 OrdinaryCallEvaluateBody ( F, argumentsList ) 23 24 1. Let status be FunctionDeclarationInstantiation(F, argumentsList). 25 [...] 26 27 9.2.12 FunctionDeclarationInstantiation(func, argumentsList) 28 29 [...] 30 23. Let iteratorRecord be Record {[[iterator]]: 31 CreateListIterator(argumentsList), [[done]]: false}. 32 24. If hasDuplicates is true, then 33 [...] 34 25. Else, 35 b. Let formalStatus be IteratorBindingInitialization for formals with 36 iteratorRecord and env as arguments. 37 [...] 38 39 13.3.3.6 Runtime Semantics: IteratorBindingInitialization 40 BindingRestElement : ... BindingIdentifier 41 [...] 3. Let A be ArrayCreate(0). [...] 5. Repeat 42 [...] 43 f. Let status be CreateDataProperty(A, ToString (n), nextValue). 44 [...] 45 ---*/ 46 var values = [1, 2, 3]; 47 48 var callCount = 0; 49 var f; 50 f = ([...x] = values) => { 51 assert(Array.isArray(x)); 52 assert.sameValue(x.length, 3); 53 assert.sameValue(x[0], 1); 54 assert.sameValue(x[1], 2); 55 assert.sameValue(x[2], 3); 56 assert.notSameValue(x, values); 57 callCount = callCount + 1; 58 }; 59 60 f(); 61 assert.sameValue(callCount, 1, 'arrow function invoked exactly once'); 62 63 reportCompare(0, 0);