dflt-ary-ptrn-empty.js (1200B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-binding/ary-ptrn-empty.case 4 // - src/dstr-binding/default/async-gen-func-decl-dflt.template 5 /*--- 6 description: No iteration occurs for an "empty" array binding pattern (async generator function declaration (default parameter)) 7 esid: sec-asyncgenerator-definitions-instantiatefunctionobject 8 features: [generators, async-iteration] 9 flags: [generated, async] 10 info: | 11 AsyncGeneratorDeclaration : async [no LineTerminator here] function * BindingIdentifier 12 ( FormalParameters ) { AsyncGeneratorBody } 13 14 [...] 15 3. Let F be ! AsyncGeneratorFunctionCreate(Normal, FormalParameters, AsyncGeneratorBody, 16 scope, strict). 17 [...] 18 19 20 13.3.3.6 Runtime Semantics: IteratorBindingInitialization 21 22 ArrayBindingPattern : [ ] 23 24 1. Return NormalCompletion(empty). 25 26 ---*/ 27 var iterations = 0; 28 var iter = function*() { 29 iterations += 1; 30 }(); 31 32 33 var callCount = 0; 34 async function* f([] = iter) { 35 assert.sameValue(iterations, 0); 36 callCount = callCount + 1; 37 }; 38 f().next().then(() => { 39 assert.sameValue(callCount, 1, 'invoked exactly once'); 40 }).then($DONE, $DONE);