tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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ary-ptrn-rest-id-elision.js (2123B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-binding/ary-ptrn-rest-id-elision.case
      3 // - src/dstr-binding/default/arrow-function.template
      4 /*---
      5 description: Rest element following elision elements (arrow function expression)
      6 esid: sec-arrow-function-definitions-runtime-semantics-evaluation
      7 features: [destructuring-binding]
      8 flags: [generated]
      9 info: |
     10    ArrowFunction : ArrowParameters => ConciseBody
     11 
     12    [...]
     13    4. Let closure be FunctionCreate(Arrow, parameters, ConciseBody, scope, strict).
     14    [...]
     15 
     16    9.2.1 [[Call]] ( thisArgument, argumentsList)
     17 
     18    [...]
     19    7. Let result be OrdinaryCallEvaluateBody(F, argumentsList).
     20    [...]
     21 
     22    9.2.1.3 OrdinaryCallEvaluateBody ( F, argumentsList )
     23 
     24    1. Let status be FunctionDeclarationInstantiation(F, argumentsList).
     25    [...]
     26 
     27    9.2.12 FunctionDeclarationInstantiation(func, argumentsList)
     28 
     29    [...]
     30    23. Let iteratorRecord be Record {[[iterator]]:
     31        CreateListIterator(argumentsList), [[done]]: false}.
     32    24. If hasDuplicates is true, then
     33        [...]
     34    25. Else,
     35        b. Let formalStatus be IteratorBindingInitialization for formals with
     36           iteratorRecord and env as arguments.
     37    [...]
     38 
     39    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
     40    ArrayBindingPattern : [ Elisionopt BindingRestElement ]
     41    1. If Elision is present, then
     42       a. Let status be the result of performing
     43          IteratorDestructuringAssignmentEvaluation of Elision with
     44          iteratorRecord as the argument.
     45       b. ReturnIfAbrupt(status).
     46    2. Return the result of performing IteratorBindingInitialization for
     47       BindingRestElement with iteratorRecord and environment as arguments.
     48 ---*/
     49 var values = [1, 2, 3, 4, 5];
     50 
     51 var callCount = 0;
     52 var f;
     53 f = ([ , , ...x]) => {
     54  assert(Array.isArray(x));
     55  assert.sameValue(x.length, 3);
     56  assert.sameValue(x[0], 3);
     57  assert.sameValue(x[1], 4);
     58  assert.sameValue(x[2], 5);
     59  assert.notSameValue(x, values);
     60  callCount = callCount + 1;
     61 };
     62 
     63 f(values);
     64 assert.sameValue(callCount, 1, 'arrow function invoked exactly once');
     65 
     66 reportCompare(0, 0);