dflt-ary-ptrn-elem-ary-rest-init.js (2217B)
1 // This file was procedurally generated from the following sources: 2 // - src/dstr-binding/ary-ptrn-elem-ary-rest-init.case 3 // - src/dstr-binding/default/func-expr-dflt.template 4 /*--- 5 description: BindingElement with array binding pattern and initializer is used (function expression (default parameter)) 6 esid: sec-function-definitions-runtime-semantics-evaluation 7 features: [destructuring-binding, default-parameters] 8 flags: [generated] 9 info: | 10 FunctionExpression : function ( FormalParameters ) { FunctionBody } 11 12 [...] 13 3. Let closure be FunctionCreate(Normal, FormalParameters, FunctionBody, 14 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 var values = [2, 1, 3]; 53 54 var callCount = 0; 55 var f; 56 f = function([[...x] = values] = []) { 57 assert(Array.isArray(x)); 58 assert.sameValue(x[0], 2); 59 assert.sameValue(x[1], 1); 60 assert.sameValue(x[2], 3); 61 assert.sameValue(x.length, 3); 62 assert.notSameValue(x, values); 63 callCount = callCount + 1; 64 }; 65 66 f(); 67 assert.sameValue(callCount, 1, 'function invoked exactly once'); 68 69 reportCompare(0, 0);