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LibJS: Return Optional<T> from Completion::{value,target}(), not T

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In the end this is a nicer API than having separate has_{value,target}()
and having to check those first, and then making another Optional from
the unwrapped value:

    completion.has_value() ? completion.value() : Optional<Value> {}
    //                       ^^^^^^^^^^^^^^^^^^
    //         Implicit creation of non-empty Optional<Value>

This way we need to unwrap the optional ourselves, but can easily pass
it to something else as well.

This is in anticipation of the AST using completions :^)
This commit is contained in:
Linus Groh 2021-12-28 17:42:14 +01:00
parent b39aede8fe
commit 85f0fc2b83
15 changed files with 55 additions and 57 deletions
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2
Userland/Libraries/LibJS/Runtime/ArrayBufferConstructor.cpp
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@ -53,7 +53,7 @@ ThrowCompletionOr<Object*> ArrayBufferConstructor::construct(FunctionObject& new
auto byte_length_or_error = vm.argument(0).to_index(global_object());
if (byte_length_or_error.is_error()) {
auto error = byte_length_or_error.release_error();
if (error.value().is_object() && is<RangeError>(error.value().as_object())) {
if (error.value()->is_object() && is<RangeError>(error.value()->as_object())) {
// Re-throw more specific RangeError
vm.clear_exception();
return vm.throw_completion<RangeError>(global_object(), ErrorType::InvalidLength, "array buffer");