tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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var-ary-ptrn-rest-id-elision.js (2037B)

      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/for-var.template
      4 /*---
      5 description: Rest element following elision elements (for statement)
      6 esid: sec-for-statement-runtime-semantics-labelledevaluation
      7 features: [destructuring-binding]
      8 flags: [generated]
      9 info: |
     10    IterationStatement :
     11        for ( var VariableDeclarationList ; Expressionopt ; Expressionopt ) Statement
     12 
     13    1. Let varDcl be the result of evaluating VariableDeclarationList.
     14    [...]
     15 
     16    13.3.2.4 Runtime Semantics: Evaluation
     17 
     18    VariableDeclarationList : VariableDeclarationList , VariableDeclaration
     19 
     20    1. Let next be the result of evaluating VariableDeclarationList.
     21    2. ReturnIfAbrupt(next).
     22    3. Return the result of evaluating VariableDeclaration.
     23 
     24    VariableDeclaration : BindingPattern Initializer
     25 
     26    1. Let rhs be the result of evaluating Initializer.
     27    2. Let rval be GetValue(rhs).
     28    3. ReturnIfAbrupt(rval).
     29    4. Return the result of performing BindingInitialization for BindingPattern
     30       passing rval and undefined as arguments.
     31 
     32    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
     33    ArrayBindingPattern : [ Elisionopt BindingRestElement ]
     34    1. If Elision is present, then
     35       a. Let status be the result of performing
     36          IteratorDestructuringAssignmentEvaluation of Elision with
     37          iteratorRecord as the argument.
     38       b. ReturnIfAbrupt(status).
     39    2. Return the result of performing IteratorBindingInitialization for
     40       BindingRestElement with iteratorRecord and environment as arguments.
     41 ---*/
     42 var values = [1, 2, 3, 4, 5];
     43 
     44 var iterCount = 0;
     45 
     46 for (var [ , , ...x] = values; iterCount < 1; ) {
     47  assert(Array.isArray(x));
     48  assert.sameValue(x.length, 3);
     49  assert.sameValue(x[0], 3);
     50  assert.sameValue(x[1], 4);
     51  assert.sameValue(x[2], 5);
     52  assert.notSameValue(x, values);
     53  iterCount += 1;
     54 }
     55 
     56 assert.sameValue(iterCount, 1, 'Iteration occurred as expected');
     57 
     58 reportCompare(0, 0);