dflt-ary-ptrn-elem-obj-prop-id-init.js (2377B)
1 // This file was procedurally generated from the following sources: 2 // - src/dstr-binding/ary-ptrn-elem-obj-prop-id-init.case 3 // - src/dstr-binding/default/gen-func-decl-dflt.template 4 /*--- 5 description: BindingElement with object binding pattern and initializer is used (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 42 BindingElement : BindingPatternInitializer opt 43 44 [...] 45 2. If iteratorRecord.[[done]] is true, let v be undefined. 46 3. If Initializer is present and v is undefined, then 47 a. Let defaultValue be the result of evaluating Initializer. 48 b. Let v be ? GetValue(defaultValue). 49 4. Return the result of performing BindingInitialization of BindingPattern 50 with v and environment as the arguments. 51 ---*/ 52 53 var callCount = 0; 54 function* f([{ u: v, w: x, y: z } = { u: 444, w: 555, y: 666 }] = []) { 55 assert.sameValue(v, 444); 56 assert.sameValue(x, 555); 57 assert.sameValue(z, 666); 58 59 assert.throws(ReferenceError, function() { 60 u; 61 }); 62 assert.throws(ReferenceError, function() { 63 w; 64 }); 65 assert.throws(ReferenceError, function() { 66 y; 67 }); 68 callCount = callCount + 1; 69 }; 70 f().next(); 71 assert.sameValue(callCount, 1, 'generator function invoked exactly once'); 72 73 reportCompare(0, 0);