tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
Log | Files | Refs | README | LICENSE

dflt-obj-ptrn-prop-id-init-skipped.js (2321B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-binding/obj-ptrn-prop-id-init-skipped.case
      3 // - src/dstr-binding/default/gen-func-decl-dflt.template
      4 /*---
      5 description: Destructuring initializer is not evaluated when value is not `undefined` (generator function declaration (default parameter))
      6 esid: sec-generator-function-definitions-runtime-semantics-instantiatefunctionobject
      7 features: [generators, destructuring-binding, default-parameters]
      8 flags: [generated]
      9 info: |
     10    GeneratorDeclaration : function * ( FormalParameters ) { GeneratorBody }
     11 
     12        [...]
     13        2. Let F be GeneratorFunctionCreate(Normal, FormalParameters,
     14           GeneratorBody, 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    13.3.3.7 Runtime Semantics: KeyedBindingInitialization
     41 
     42    BindingElement : BindingPattern Initializeropt
     43 
     44    [...]
     45    3. If Initializer is present and v is undefined, then
     46    [...]
     47 ---*/
     48 var initCount = 0;
     49 function counter() {
     50  initCount += 1;
     51 }
     52 
     53 var callCount = 0;
     54 function* f({ s: t = counter(), u: v = counter(), w: x = counter(), y: z = counter() } = { s: null, u: 0, w: false, y: '' }) {
     55  assert.sameValue(t, null);
     56  assert.sameValue(v, 0);
     57  assert.sameValue(x, false);
     58  assert.sameValue(z, '');
     59  assert.sameValue(initCount, 0);
     60 
     61  assert.throws(ReferenceError, function() {
     62    s;
     63  });
     64  assert.throws(ReferenceError, function() {
     65    u;
     66  });
     67  assert.throws(ReferenceError, function() {
     68    w;
     69  });
     70  assert.throws(ReferenceError, function() {
     71    y;
     72  });
     73  callCount = callCount + 1;
     74 };
     75 f().next();
     76 assert.sameValue(callCount, 1, 'generator function invoked exactly once');
     77 
     78 reportCompare(0, 0);