dflt-params-arg-val-not-undefined.js (2332B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/function-forms/dflt-params-arg-val-not-undefined.case 4 // - src/function-forms/default/async-gen-func-expr.template 5 /*--- 6 description: Use of initializer when argument value is not `undefined` (async generator function expression) 7 esid: sec-asyncgenerator-definitions-evaluation 8 features: [default-parameters, async-iteration] 9 flags: [generated, async] 10 info: | 11 AsyncGeneratorExpression : async [no LineTerminator here] function * ( FormalParameters ) { 12 AsyncGeneratorBody } 13 14 [...] 15 3. Let closure be ! AsyncGeneratorFunctionCreate(Normal, FormalParameters, 16 AsyncGeneratorBody, scope, strict). 17 [...] 18 19 20 14.1.19 Runtime Semantics: IteratorBindingInitialization 21 22 FormalsList : FormalsList , FormalParameter 23 24 [...] 25 23. Let iteratorRecord be Record {[[Iterator]]: 26 CreateListIterator(argumentsList), [[Done]]: false}. 27 24. If hasDuplicates is true, then 28 [...] 29 25. Else, 30 a. Perform ? IteratorBindingInitialization for formals with 31 iteratorRecord and env as arguments. 32 [...] 33 34 ---*/ 35 var obj = {}; 36 var falseCount = 0; 37 var stringCount = 0; 38 var nanCount = 0; 39 var zeroCount = 0; 40 var nullCount = 0; 41 var objCount = 0; 42 43 44 var callCount = 0; 45 // Stores a reference `ref` for case evaluation 46 var ref; 47 ref = async function*(aFalse = falseCount +=1, aString = stringCount += 1, aNaN = nanCount += 1, a0 = zeroCount += 1, aNull = nullCount += 1, aObj = objCount +=1) { 48 assert.sameValue(aFalse, false); 49 assert.sameValue(aString, ''); 50 assert.sameValue(aNaN, NaN); 51 assert.sameValue(a0, 0); 52 assert.sameValue(aNull, null); 53 assert.sameValue(aObj, obj); 54 callCount = callCount + 1; 55 }; 56 57 ref(false, '', NaN, 0, null, obj).next().then(() => { 58 assert.sameValue(callCount, 1, 'generator function invoked exactly once'); 59 }).then($DONE, $DONE); 60 61 assert.sameValue(falseCount, 0, 'initializer not evaluated: false'); 62 assert.sameValue(stringCount, 0, 'initializer not evaluated: string'); 63 assert.sameValue(nanCount, 0, 'initializer not evaluated: NaN'); 64 assert.sameValue(zeroCount, 0, 'initializer not evaluated: 0'); 65 assert.sameValue(nullCount, 0, 'initializer not evaluated: null'); 66 assert.sameValue(objCount, 0, 'initializer not evaluated: object');