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LibJS: Add a fallible variant of Array::create_from

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Timothy Flynn 2023-01-21 22:34:42 -05:00 • committed by Tim Flynn
parent 879a590882
commit f2527c8c81
1 changed files with 16 additions and 0 deletions
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16
Userland/Libraries/LibJS/Runtime/Array.h
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@ -8,12 +8,14 @@
#pragma once
#include <AK/Assertions.h>
#include <AK/Concepts.h>
#include <AK/Function.h>
#include <AK/Span.h>
#include <AK/Vector.h>
#include <LibJS/Runtime/Completion.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/Object.h>
#include <LibJS/Runtime/VM.h>
namespace JS {
@ -23,6 +25,7 @@ class Array : public Object {
public:
static ThrowCompletionOr<NonnullGCPtr<Array>> create(Realm&, u64 length, Object* prototype = nullptr);
static NonnullGCPtr<Array> create_from(Realm&, Vector<Value> const&);
// Non-standard but equivalent to CreateArrayFromList.
template<typename T>
static NonnullGCPtr<Array> create_from(Realm& realm, Span<T const> elements, Function<Value(T const&)> map_fn)
@ -35,6 +38,19 @@ public:
return Array::create_from(realm, values);
}
// Non-standard but equivalent to CreateArrayFromList.
template<typename T, FallibleFunction<T const&> Callback>
static ThrowCompletionOr<NonnullGCPtr<Array>> try_create_from(VM& vm, Realm& realm, Span<T const> elements, Callback map_fn)
{
auto values = MarkedVector<Value> { realm.heap() };
TRY_OR_THROW_OOM(vm, values.try_ensure_capacity(elements.size()));
for (auto const& element : elements)
TRY_OR_THROW_OOM(vm, values.try_append(TRY(map_fn(element))));
return Array::create_from(realm, values);
}
virtual ~Array() override = default;
virtual ThrowCompletionOr<Optional<PropertyDescriptor>> internal_get_own_property(PropertyKey const&) const override;