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LibJS: Add %TypedArray%.prototype.lastIndexOf
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3 changed files with 94 additions and 0 deletions
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@ -36,6 +36,7 @@ void TypedArrayPrototype::initialize(GlobalObject& object)
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define_native_function(vm.names.forEach, for_each, 1, attr);
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define_native_function(vm.names.includes, includes, 1, attr);
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define_native_function(vm.names.indexOf, index_of, 1, attr);
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define_native_function(vm.names.lastIndexOf, last_index_of, 1, attr);
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define_native_function(vm.names.some, some, 1, attr);
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define_native_function(vm.names.join, join, 1, attr);
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define_native_function(vm.names.keys, keys, 0, attr);
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@ -355,6 +356,54 @@ JS_DEFINE_NATIVE_FUNCTION(TypedArrayPrototype::index_of)
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return Value(-1);
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}
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// 23.2.3.17 %TypedArray%.prototype.lastIndexOf ( searchElement [ , fromIndex ] ), https://tc39.es/ecma262/#sec-%typedarray%.prototype.lastindexof
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JS_DEFINE_NATIVE_FUNCTION(TypedArrayPrototype::last_index_of)
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{
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auto typed_array = typed_array_from(vm, global_object);
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if (!typed_array)
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return {};
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auto length = typed_array->array_length();
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if (length == 0)
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return Value(-1);
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double n;
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if (vm.argument_count() > 1) {
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n = vm.argument(1).to_integer_or_infinity(global_object);
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if (vm.exception())
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return {};
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} else {
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n = length - 1;
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}
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if (Value(n).is_negative_infinity())
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return Value(-1);
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i32 k;
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if (n >= 0) {
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k = min(n, (i32)length - 1);
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} else {
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auto relative_k = length + n;
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if (relative_k < 0) // ensures we dont underflow `k`
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relative_k = -1;
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k = relative_k;
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}
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auto search_element = vm.argument(0);
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for (; k >= 0; --k) {
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auto k_present = typed_array->has_property(k);
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if (k_present) {
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auto element_k = typed_array->get(k);
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if (strict_eq(search_element, element_k))
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return Value(k);
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}
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}
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return Value(-1);
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}
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// 23.2.3.25 %TypedArray%.prototype.some ( callbackfn [ , thisArg ] ), https://tc39.es/ecma262/#sec-%typedarray%.prototype.some
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JS_DEFINE_NATIVE_FUNCTION(TypedArrayPrototype::some)
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{
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@ -33,6 +33,7 @@ private:
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JS_DECLARE_NATIVE_FUNCTION(for_each);
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JS_DECLARE_NATIVE_FUNCTION(includes);
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JS_DECLARE_NATIVE_FUNCTION(index_of);
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JS_DECLARE_NATIVE_FUNCTION(last_index_of);
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JS_DECLARE_NATIVE_FUNCTION(some);
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JS_DECLARE_NATIVE_FUNCTION(join);
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JS_DECLARE_NATIVE_FUNCTION(keys);
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