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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /js/src/tests/non262/lexical-environment/unscopables-basics.js | |
parent | Initial commit. (diff) | |
download | firefox-esr-upstream.tar.xz firefox-esr-upstream.zip |
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'js/src/tests/non262/lexical-environment/unscopables-basics.js')
-rw-r--r-- | js/src/tests/non262/lexical-environment/unscopables-basics.js | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/js/src/tests/non262/lexical-environment/unscopables-basics.js b/js/src/tests/non262/lexical-environment/unscopables-basics.js new file mode 100644 index 0000000000..4032b27746 --- /dev/null +++ b/js/src/tests/non262/lexical-environment/unscopables-basics.js @@ -0,0 +1,22 @@ +// Basics of @@unscopables support. + +// In with(obj), if obj[@@unscopables][id] is truthy, then the identifier id +// is not present as a binding in the with-block's scope. +var x = "global"; +with ({x: "with", [Symbol.unscopables]: {x: true}}) + assertEq(x, "global"); + +// But if obj[@@unscopables][id] is false or not present, there is a binding. +with ({y: "with", z: "with", [Symbol.unscopables]: {y: false}}) { + assertEq(y, "with"); + assertEq(z, "with"); +} + +// ToBoolean(obj[@@unscopables][id]) determines whether there's a binding. +let someValues = [0, -0, NaN, "", undefined, null, "x", {}, []]; +for (let v of someValues) { + with ({x: "with", [Symbol.unscopables]: {x: v}}) + assertEq(x, v ? "global" : "with"); +} + +reportCompare(0, 0); |