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LibJS: Add %TypedArray%.prototype.lastIndexOf

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Idan Horowitz 2021-07-08 04:39:37 +03:00 • committed by Linus Groh
parent 6343bfa9d7
commit f0abcde00c
3 changed files with 94 additions and 0 deletions
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49
Userland/Libraries/LibJS/Runtime/TypedArrayPrototype.cpp
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@ -36,6 +36,7 @@ void TypedArrayPrototype::initialize(GlobalObject& object)
define_native_function(vm.names.forEach, for_each, 1, attr);
define_native_function(vm.names.includes, includes, 1, attr);
define_native_function(vm.names.indexOf, index_of, 1, attr);
define_native_function(vm.names.lastIndexOf, last_index_of, 1, attr);
define_native_function(vm.names.some, some, 1, attr);
define_native_function(vm.names.join, join, 1, attr);
define_native_function(vm.names.keys, keys, 0, attr);
@ -355,6 +356,54 @@ JS_DEFINE_NATIVE_FUNCTION(TypedArrayPrototype::index_of)
return Value(-1);
}
// 23.2.3.17 %TypedArray%.prototype.lastIndexOf ( searchElement [ , fromIndex ] ), https://tc39.es/ecma262/#sec-%typedarray%.prototype.lastindexof
JS_DEFINE_NATIVE_FUNCTION(TypedArrayPrototype::last_index_of)
{
auto typed_array = typed_array_from(vm, global_object);
if (!typed_array)
return {};
auto length = typed_array->array_length();
if (length == 0)
return Value(-1);
double n;
if (vm.argument_count() > 1) {
n = vm.argument(1).to_integer_or_infinity(global_object);
if (vm.exception())
return {};
} else {
n = length - 1;
}
if (Value(n).is_negative_infinity())
return Value(-1);
i32 k;
if (n >= 0) {
k = min(n, (i32)length - 1);
} else {
auto relative_k = length + n;
if (relative_k < 0) // ensures we dont underflow `k`
relative_k = -1;
k = relative_k;
}
auto search_element = vm.argument(0);
for (; k >= 0; --k) {
auto k_present = typed_array->has_property(k);
if (k_present) {
auto element_k = typed_array->get(k);
if (strict_eq(search_element, element_k))
return Value(k);
}
}
return Value(-1);
}
// 23.2.3.25 %TypedArray%.prototype.some ( callbackfn [ , thisArg ] ), https://tc39.es/ecma262/#sec-%typedarray%.prototype.some
JS_DEFINE_NATIVE_FUNCTION(TypedArrayPrototype::some)
{

1
Userland/Libraries/LibJS/Runtime/TypedArrayPrototype.h
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@ -33,6 +33,7 @@ private:
JS_DECLARE_NATIVE_FUNCTION(for_each);
JS_DECLARE_NATIVE_FUNCTION(includes);
JS_DECLARE_NATIVE_FUNCTION(index_of);
JS_DECLARE_NATIVE_FUNCTION(last_index_of);
JS_DECLARE_NATIVE_FUNCTION(some);
JS_DECLARE_NATIVE_FUNCTION(join);
JS_DECLARE_NATIVE_FUNCTION(keys);