| // This file was procedurally generated from the following sources: |
| // - src/dstr-binding/ary-ptrn-rest-ary-elem.case |
| // - src/dstr-binding/default/for-of-let.template |
| /*--- |
| description: Rest element containing an array BindingElementList pattern (for-of statement) |
| esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation |
| features: [destructuring-binding] |
| flags: [generated] |
| info: | |
| IterationStatement : |
| for ( ForDeclaration of AssignmentExpression ) Statement |
| |
| [...] |
| 3. Return ForIn/OfBodyEvaluation(ForDeclaration, Statement, keyResult, |
| lexicalBinding, labelSet). |
| |
| 13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation |
| |
| [...] |
| 3. Let destructuring be IsDestructuring of lhs. |
| [...] |
| 5. Repeat |
| [...] |
| h. If destructuring is false, then |
| [...] |
| i. Else |
| i. If lhsKind is assignment, then |
| [...] |
| ii. Else if lhsKind is varBinding, then |
| [...] |
| iii. Else, |
| 1. Assert: lhsKind is lexicalBinding. |
| 2. Assert: lhs is a ForDeclaration. |
| 3. Let status be the result of performing BindingInitialization |
| for lhs passing nextValue and iterationEnv as arguments. |
| [...] |
| |
| 13.3.3.6 Runtime Semantics: IteratorBindingInitialization |
| |
| BindingRestElement : ... BindingPattern |
| |
| 1. Let A be ArrayCreate(0). |
| [...] |
| 3. Repeat |
| [...] |
| b. If iteratorRecord.[[done]] is true, then |
| i. Return the result of performing BindingInitialization of |
| BindingPattern with A and environment as the arguments. |
| [...] |
| |
| 13.3.3.6 Runtime Semantics: IteratorBindingInitialization |
| |
| SingleNameBinding : BindingIdentifier Initializeropt |
| |
| [...] |
| 4. If iteratorRecord.[[done]] is false, then |
| a. Let next be IteratorStep(iteratorRecord.[[iterator]]). |
| b. If next is an abrupt completion, set iteratorRecord.[[done]] to true. |
| c. ReturnIfAbrupt(next). |
| d. If next is false, set iteratorRecord.[[done]] to true. |
| e. Else, |
| [...] |
| i. Let v be IteratorValue(next). |
| ii. If v is an abrupt completion, set |
| iteratorRecord.[[done]] to true. |
| iii. ReturnIfAbrupt(v). |
| 5. If iteratorRecord.[[done]] is true, let v be undefined. |
| [...] |
| 8. Return InitializeReferencedBinding(lhs, v). |
| ---*/ |
| |
| var iterCount = 0; |
| |
| for (let [...[x, y, z]] of [[3, 4, 5]]) { |
| assert.sameValue(x, 3); |
| assert.sameValue(y, 4); |
| assert.sameValue(z, 5); |
| |
| iterCount += 1; |
| } |
| |
| assert.sameValue(iterCount, 1, 'Iteration occurred as expected'); |