Questions tagged [types]
Types, and type systems, are used to enforce levels of abstraction in programs.
types
28,917
questions
1
vote
1
answer
39
views
R get local variable from formula
Consider the R code :
foo <- function(formula){
Y <- get(formula[[2]])
print(Y)
}
main <- function(){
Y <- 1
X <- 2
foo(Y ~ X)
}
main()
The outcome says that in get(...
- 344
0
votes
0
answers
22
views
check if given object implements certain generic interface; type argument(s) NOT known [duplicate]
I have some object. I want to check at runtime if it is an IReadOnlyCollection<T> of any T, i.e. I cannot specify that T in my check. So it should return true for e.g. IReadOnlyCollection<...
- 2,794
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votes
0
answers
37
views
As a wrapper object in JavaScript, why can not use 'new' to create a BigInt in JavasScript? [duplicate]
There are 5 wrapper objects in JavaScript: Number, BigInt, String, Boolean, and Symbol.You can use 'new' to create a Number, String, Boolean, Symbol. But you can not use 'new' to create a BigInt. what ...
- 9
-2
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0
answers
80
views
Are there objects for primitive data types? [duplicate]
If the object represents a data type, is the variable for a primitive data type like an integer also an object representing this type, or do objects not represent primitive data types?
// Let's assume ...
1
vote
1
answer
55
views
Why print(f"{variable = }") in Python 3.12 also prints numpy type?
I noticed, that with Python 3.12 and a numpy.float64 when I simply do a
x = numpy.sqrt(3) # type is <class 'numpy.float64'> now
print(f"{x = }")
# this is printed
>>>x = np....
- 11
0
votes
1
answer
53
views
How to enforce error on impossible switch case?
There is a linter we can enable for equality check. What about switch case ? This does not seem to work. https://stackoverflow.com/a/78736339/6727914
How to convert the warning into errors ?
Example:
...
- 19.5k
3
votes
1
answer
62
views
How to enforce error on impossible equality check?
There is a linter to it https://dart.dev/tools/linter-rules/unrelated_type_equality_checks but it just shows a warning, rendering it almost useless for large projects.
How to convert the warning into ...
- 19.5k
1
vote
0
answers
18
views
Why am I having an issue with typescript and Prisma ORM when trying to find a unique item?
I am having issues with my ability to use the prisma .findUnique() function call. My code doesn't show any compilation error, but when I actually try to go to a product page it causes a runtime error.
...
- 19
0
votes
1
answer
21
views
Checking subclass against metaclass type
I have a set of plugins that inherit from a metaclass. the metaclasss is defined like so:
from abc import ABC, abstractmethod
class MetaReader(ABC):
def __init__(self, arg1, arg2, **kwargs):
...
- 1,362
1
vote
0
answers
28
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Unexpected behavior when combining mapped type created from Union that is used within conditional type [duplicate]
I came across some unexpected behavior when trying to expand mapped type I created from an union of object types, when trying to use this type within conditional type: Playground
export type ...
- 7,673
1
vote
1
answer
46
views
How to Properly Implement Role-Based Authorization in React Using Context API and React Query?
I am trying to work on a React application where I want to implement role-based authorization.
My goal is to fetch user roles from an API and store them in context so they can be accessed throughout ...
- 67
0
votes
1
answer
161
views
How to parameter pack pairs of types?
Here's an example usage of a parameter pack:
template <typename... T>
bool foo(A x) {
return (baz<T>(x) || ...);
}
I'd like to do something similar, but with pairs of types. Here's an ...
- 1,183
2
votes
1
answer
62
views
C# generic method detect if T is array and then index into the array
I'm trying to write a Dbg debug function that will print out some debug info about the given parameter and then return it. I would like arrays to be printed as the list of elements, and scalars to ...
- 809
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votes
2
answers
94
views
Custom integer-like datatype with support for static casts without warnings
I'm writing my own little utility library, and I've opted to do something which I don't really see often (and there might be a reason) - I'm trying to implement a 'perfect' wrapper around C++ integer ...
- 69
0
votes
0
answers
32
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exported variables always return undefined in discord.JS V14
in events/messageCache.ts:
import { Events, Message } from 'discord.js';
export interface MessageCacheEntery {
authorID: string;
deleted: boolean;
message: string;
timestamp: number;
}...
- 11