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LibJS: Add a fallible variant of Array::create_from
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@ -8,12 +8,14 @@
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#pragma once
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#include <AK/Assertions.h>
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#include <AK/Concepts.h>
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#include <AK/Function.h>
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#include <AK/Span.h>
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#include <AK/Vector.h>
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#include <LibJS/Runtime/Completion.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/Object.h>
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#include <LibJS/Runtime/VM.h>
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namespace JS {
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@ -23,6 +25,7 @@ class Array : public Object {
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public:
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static ThrowCompletionOr<NonnullGCPtr<Array>> create(Realm&, u64 length, Object* prototype = nullptr);
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static NonnullGCPtr<Array> create_from(Realm&, Vector<Value> const&);
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// Non-standard but equivalent to CreateArrayFromList.
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template<typename T>
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static NonnullGCPtr<Array> create_from(Realm& realm, Span<T const> elements, Function<Value(T const&)> map_fn)
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@ -35,6 +38,19 @@ public:
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return Array::create_from(realm, values);
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}
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// Non-standard but equivalent to CreateArrayFromList.
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template<typename T, FallibleFunction<T const&> Callback>
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static ThrowCompletionOr<NonnullGCPtr<Array>> try_create_from(VM& vm, Realm& realm, Span<T const> elements, Callback map_fn)
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{
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auto values = MarkedVector<Value> { realm.heap() };
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TRY_OR_THROW_OOM(vm, values.try_ensure_capacity(elements.size()));
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for (auto const& element : elements)
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TRY_OR_THROW_OOM(vm, values.try_append(TRY(map_fn(element))));
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return Array::create_from(realm, values);
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}
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virtual ~Array() override = default;
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virtual ThrowCompletionOr<Optional<PropertyDescriptor>> internal_get_own_property(PropertyKey const&) const override;
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