dflt-obj-ptrn-prop-ary-init.js (1534B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-binding/obj-ptrn-prop-ary-init.case 4 // - src/dstr-binding/default/async-gen-func-decl-dflt.template 5 /*--- 6 description: Object binding pattern with "nested" array binding pattern using initializer (async generator function declaration (default parameter)) 7 esid: sec-asyncgenerator-definitions-instantiatefunctionobject 8 features: [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 13.3.3.7 Runtime Semantics: KeyedBindingInitialization 21 22 [...] 23 3. If Initializer is present and v is undefined, then 24 a. Let defaultValue be the result of evaluating Initializer. 25 b. Let v be GetValue(defaultValue). 26 c. ReturnIfAbrupt(v). 27 4. Return the result of performing BindingInitialization for BindingPattern 28 passing v and environment as arguments. 29 ---*/ 30 31 32 var callCount = 0; 33 async function* f({ w: [x, y, z] = [4, 5, 6] } = {}) { 34 assert.sameValue(x, 4); 35 assert.sameValue(y, 5); 36 assert.sameValue(z, 6); 37 38 assert.throws(ReferenceError, function() { 39 w; 40 }); 41 callCount = callCount + 1; 42 }; 43 f().next().then(() => { 44 assert.sameValue(callCount, 1, 'invoked exactly once'); 45 }).then($DONE, $DONE);