ary-ptrn-elem-ary-rest-init.js (1629B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-binding/ary-ptrn-elem-ary-rest-init.case 4 // - src/dstr-binding/default/async-gen-func-expr.template 5 /*--- 6 description: BindingElement with array binding pattern and initializer is used (async generator function expression) 7 esid: sec-asyncgenerator-definitions-evaluation 8 features: [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 13.3.3.6 Runtime Semantics: IteratorBindingInitialization 21 22 BindingElement : BindingPatternInitializer opt 23 24 [...] 25 2. If iteratorRecord.[[done]] is true, let v be undefined. 26 3. If Initializer is present and v is undefined, then 27 a. Let defaultValue be the result of evaluating Initializer. 28 b. Let v be ? GetValue(defaultValue). 29 4. Return the result of performing BindingInitialization of BindingPattern 30 with v and environment as the arguments. 31 ---*/ 32 var values = [2, 1, 3]; 33 34 35 var callCount = 0; 36 var f; 37 f = async function*([[...x] = values]) { 38 assert(Array.isArray(x)); 39 assert.sameValue(x[0], 2); 40 assert.sameValue(x[1], 1); 41 assert.sameValue(x[2], 3); 42 assert.sameValue(x.length, 3); 43 assert.notSameValue(x, values); 44 callCount = callCount + 1; 45 }; 46 47 f([]).next().then(() => { 48 assert.sameValue(callCount, 1, 'invoked exactly once'); 49 }).then($DONE, $DONE);