Questions tagged [option-type]
The option type or maybe type is a polymorphic type that represents encapsulation of an optional value where one side encapsulates the value, and other side represents the absence of the value (None, Nothing, etc). This tag is adequate for questions about `Option` in Scala, `Optional` in Java and Swift, `std::optional` in C++ and similar types.
option-type
3,820
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Cannot Stream average() undefined for OptionalDouble
I'm using this code but eclipse shows an error saying
stream() is undefined for the type OptionalDouble
The error shown by eclipse is
The method stream() is undefined for the type OptionalDouble .
...
- 159
0
votes
0
answers
47
views
How to create working powershell module with optional flags
I have a function that I am trying to make unto a module to use in my daily sripts. I want it to work kind of like (writeI -host "hello" -fore red -back black" where it has flags and ...
0
votes
1
answer
223
views
How to resolve incompatible type Optional type conflict?
Hi anyone know how to resolve this error in py3? Getting error message like:
"int" has incompatible type "Union[float, int, str, None]"; expected
"Union[str, bytes, ...
- 359
0
votes
1
answer
53
views
Concise way to deal with missing values
I'm looking for a way to gracefully and concisely handle different cases in which one or another value may be absent. A concrete example use case could be to log which values were absent, as ...
- 675
1
vote
1
answer
309
views
What's the Idiomatic Way in Kotlin to Use Streams with map and orElseThrow?
I am transitioning from Java to Kotlin and am used to working with Java Streams. I have the following two Kotlin snippets that essentially do the same thing: they attempt to create a retrospective ...
- 916
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votes
1
answer
440
views
Lazy initialisation of lazy_static?
I've already had some success with lazy_static:
static ref WORD_COUNT_REPORTING_STEP_MUTEX: Arc<Mutex<usize>> = Arc::new(Mutex::new(0));
static ref INDEX_NAME: RwLock<String> = ...
- 15.1k
1
vote
1
answer
44
views
Why typescript cannot refer the type in my example correctly?
Considering the code for Option ADT as below (pretty similar to fp-ts Option):
export type Option<A> = Some<A> | None
export interface Some<A> {
_tag: 'Some'
value: A
}
export ...
- 2,000
0
votes
1
answer
107
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std::optional with Eigen::ArrayBase
template <typename Derived>
std::optional<Eigen::Array<typename Derived::Scalar, Eigen::Dynamic, Eigen::Dynamic>>
function1(const std::optional<Eigen::ArrayBase<Derived>>&...
0
votes
1
answer
91
views
Implementing the Option Functor in Julia - while maintaining type stability
First off, I have created the following attempt at an Option-type in Julia:
# building an Option-type
abstract type MyNothing end
struct None{T} <: MyNothing end
Option = Union{Some{T},None{T}} ...
0
votes
1
answer
51
views
How to filter out all valid typed values from an optional typed array in Ballerina
How to filter all valid typed values from an optional typed array in Ballerina? This can be done using foreach like below,
int?[] input = [1, 2, (), 3, 4, ()];
int[] output = [];
foreach int? i in ...
- 374
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votes
2
answers
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Bootstrap 5 is not working after I using Select2 dropdown
The Select2 functionality is functioning correctly. However, there is an issue with Bootstrap, after using Select2, Bootstrap is not working anymore. I am using Bootstrap 5.3.The picture show that the ...
- 1
3
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2
answers
162
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What are good strategies for handling Option - Some(null) in F#
I am new to the F# language and encountered exceptions when pattern matching Some and None using an Option type with a string value. This was discovered using FSCheck. Given a (string option) property ...
1
vote
2
answers
160
views
Chaining Optional and Stream in Java(preferably 11)
I have a list of Foo objects, where each Foo contains a name and a List<Strings>.
I am trying to
find if the fooList contains a Foo object with a target name, and if such element exists,
find ...
- 33
-2
votes
1
answer
195
views
How to fix this force cast in swift
I am facing this below issue in my project, kindly help me to fix this issue.
Force Cast Violation: Force casts should be avoided. (force_cast)
var guestNetworks: [WanNetworks] {
for result in ...
- 1,242
1
vote
3
answers
56
views
Return type depending on optional generic type Typescript
I made the following function to generate an object (map) [key] : value from an array.
I want to make the value method optional, and in this case just return the item as it is.
Here is my code :
...
- 533