tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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dflt-ary-ptrn-rest-id.js (1926B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-binding/ary-ptrn-rest-id.case
      3 // - src/dstr-binding/default/func-expr-dflt.template
      4 /*---
      5 description: Lone rest element (function expression (default parameter))
      6 esid: sec-function-definitions-runtime-semantics-evaluation
      7 features: [destructuring-binding, default-parameters]
      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    BindingRestElement : ... BindingIdentifier
     42    [...] 3. Let A be ArrayCreate(0). [...] 5. Repeat
     43       [...]
     44       f. Let status be CreateDataProperty(A, ToString (n), nextValue).
     45       [...]
     46 ---*/
     47 var values = [1, 2, 3];
     48 
     49 var callCount = 0;
     50 var f;
     51 f = function([...x] = values) {
     52  assert(Array.isArray(x));
     53  assert.sameValue(x.length, 3);
     54  assert.sameValue(x[0], 1);
     55  assert.sameValue(x[1], 2);
     56  assert.sameValue(x[2], 3);
     57  assert.notSameValue(x, values);
     58  callCount = callCount + 1;
     59 };
     60 
     61 f();
     62 assert.sameValue(callCount, 1, 'function invoked exactly once');
     63 
     64 reportCompare(0, 0);