tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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ary-ptrn-rest-id-elision.js (2157B)

      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/func-expr.template
      4 /*---
      5 description: Rest element following elision elements (function expression)
      6 esid: sec-function-definitions-runtime-semantics-evaluation
      7 features: [destructuring-binding]
      8 flags: [generated]
      9 info: |
     10    FunctionExpression : function ( FormalParameters ) { FunctionBody }
     11 
     12        [...]
     13        3. Let closure be FunctionCreate(Normal, FormalParameters, FunctionBody,
     14           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    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
     41    ArrayBindingPattern : [ Elisionopt BindingRestElement ]
     42    1. If Elision is present, then
     43       a. Let status be the result of performing
     44          IteratorDestructuringAssignmentEvaluation of Elision with
     45          iteratorRecord as the argument.
     46       b. ReturnIfAbrupt(status).
     47    2. Return the result of performing IteratorBindingInitialization for
     48       BindingRestElement with iteratorRecord and environment as arguments.
     49 ---*/
     50 var values = [1, 2, 3, 4, 5];
     51 
     52 var callCount = 0;
     53 var f;
     54 f = function([ , , ...x]) {
     55  assert(Array.isArray(x));
     56  assert.sameValue(x.length, 3);
     57  assert.sameValue(x[0], 3);
     58  assert.sameValue(x[1], 4);
     59  assert.sameValue(x[2], 5);
     60  assert.notSameValue(x, values);
     61  callCount = callCount + 1;
     62 };
     63 
     64 f(values);
     65 assert.sameValue(callCount, 1, 'function invoked exactly once');
     66 
     67 reportCompare(0, 0);