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Diffstat (limited to 'js/src/tests/test262/annexB/language/expressions/assignment/dstr/array-pattern-emulates-undefined.js')
-rw-r--r-- | js/src/tests/test262/annexB/language/expressions/assignment/dstr/array-pattern-emulates-undefined.js | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/js/src/tests/test262/annexB/language/expressions/assignment/dstr/array-pattern-emulates-undefined.js b/js/src/tests/test262/annexB/language/expressions/assignment/dstr/array-pattern-emulates-undefined.js new file mode 100644 index 0000000000..e65bbe0aae --- /dev/null +++ b/js/src/tests/test262/annexB/language/expressions/assignment/dstr/array-pattern-emulates-undefined.js @@ -0,0 +1,46 @@ +// Copyright (C) 2020 Alexey Shvayka. All rights reserved. +// This code is governed by the BSD license found in the LICENSE file. +/*--- +esid: sec-destructuring-binding-patterns-runtime-semantics-bindinginitialization +description: > + Destructuring initializer is not evaluated when value is an object + with [[IsHTMLDDA]] internal slot. +info: | + BindingPattern : ArrayBindingPattern + + 1. Let iteratorRecord be ? GetIterator(value). + 2. Let result be IteratorBindingInitialization of ArrayBindingPattern with arguments + iteratorRecord and environment. + 3. If iteratorRecord.[[Done]] is false, return ? IteratorClose(iteratorRecord, result). + 4. Return result. + + Runtime Semantics: IteratorBindingInitialization + + SingleNameBinding : BindingIdentifier Initializer[opt] + + [...] + 5. If Initializer is present and v is undefined, then + [...] + 6. If environment is undefined, return ? PutValue(lhs, v). +features: [destructuring-binding, IsHTMLDDA] +---*/ + +var IsHTMLDDA = $262.IsHTMLDDA; +var initCount = 0; +var counter = function() { + initCount += 1; +}; + +var x; +([x = counter()] = [IsHTMLDDA]); + +assert.sameValue(x, IsHTMLDDA); +assert.sameValue(initCount, 0); + +var base = {}; +([base.y = counter()] = [IsHTMLDDA]); + +assert.sameValue(base.y, IsHTMLDDA); +assert.sameValue(initCount, 0); + +reportCompare(0, 0); |