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LibJS: Expose BYTES_PER_ELEMENT on each TypedArray

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Luke 2021-05-21 21:25:09 +01:00 • committed by Linus Groh
parent 7d12f49e74
commit 6f1688279a
2 changed files with 20 additions and 0 deletions
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2
Userland/Libraries/LibJS/Runtime/TypedArray.cpp
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@ -194,6 +194,8 @@ void TypedArrayBase::visit_edges(Visitor& visitor)
PrototypeName::PrototypeName(GlobalObject& global_object) \
: Object(*global_object.typed_array_prototype()) \
{ \
auto& vm = this->vm(); \
define_property(vm.names.BYTES_PER_ELEMENT, Value((i32)sizeof(Type)), 0); \
} \
PrototypeName::~PrototypeName() { } \
\

18
Userland/Libraries/LibJS/Tests/builtins/TypedArray/TypedArray.prototype.BYTES_PER_ELEMENT.js Normal file
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@ -0,0 +1,18 @@
// Update when more typed arrays get added
const TYPED_ARRAYS = [
{ array: Uint8Array, expected: 1 },
{ array: Uint16Array, expected: 2 },
{ array: Uint32Array, expected: 4 },
{ array: Int8Array, expected: 1 },
{ array: Int16Array, expected: 2 },
{ array: Int32Array, expected: 4 },
{ array: Float32Array, expected: 4 },
{ array: Float64Array, expected: 8 },
];
test("basic functionality", () => {
TYPED_ARRAYS.forEach(T => {
const typedArray = new T.array();
expect(typedArray.BYTES_PER_ELEMENT).toBe(T.expected);
});
});