dflt-ary-ptrn-rest-id.js (1995B)
1 // This file was procedurally generated from the following sources: 2 // - src/dstr-binding/ary-ptrn-rest-id.case 3 // - src/dstr-binding/default/gen-func-decl-dflt.template 4 /*--- 5 description: Lone rest element (generator function declaration (default parameter)) 6 esid: sec-generator-function-definitions-runtime-semantics-instantiatefunctionobject 7 features: [generators, destructuring-binding, default-parameters] 8 flags: [generated] 9 info: | 10 GeneratorDeclaration : function * ( FormalParameters ) { GeneratorBody } 11 12 [...] 13 2. Let F be GeneratorFunctionCreate(Normal, FormalParameters, 14 GeneratorBody, scope, strict). 15 [...] 16 17 9.2.1 [[Call]] ( thisArgument, argumentsList) 18 19 [...] 20 7. Let result be OrdinaryCallEvaluateBody(F, argumentsList). 21 [...] 22 23 9.2.1.3 OrdinaryCallEvaluateBody ( F, argumentsList ) 24 25 1. Let status be FunctionDeclarationInstantiation(F, argumentsList). 26 [...] 27 28 9.2.12 FunctionDeclarationInstantiation(func, argumentsList) 29 30 [...] 31 23. Let iteratorRecord be Record {[[iterator]]: 32 CreateListIterator(argumentsList), [[done]]: false}. 33 24. If hasDuplicates is true, then 34 [...] 35 25. Else, 36 b. Let formalStatus be IteratorBindingInitialization for formals with 37 iteratorRecord and env as arguments. 38 [...] 39 40 13.3.3.6 Runtime Semantics: IteratorBindingInitialization 41 BindingRestElement : ... BindingIdentifier 42 [...] 3. Let A be ArrayCreate(0). [...] 5. Repeat 43 [...] 44 f. Let status be CreateDataProperty(A, ToString (n), nextValue). 45 [...] 46 ---*/ 47 var values = [1, 2, 3]; 48 49 var callCount = 0; 50 function* 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 f().next(); 60 assert.sameValue(callCount, 1, 'generator function invoked exactly once'); 61 62 reportCompare(0, 0);