typeof Questions
6
Solved
Is typeof in C, really an operator?
I'm thinking because there is no polymorphism in C, that there is nothing to do at run-time. That is, the answer to typeof is known at compile-time. (I can't thi...
12
Solved
4
Solved
I'm quite new to the front end - trying to implement client side on React. After adding "react-native" dependency and running webpack I'm getting the following error:
ERROR in ./node_modules/react...
Diamagnetic asked 4/4, 2020 at 22:51
16
Solved
I've seen many people use the following code:
Type t = typeof(SomeType);
if (t == typeof(int))
// Some code here
But I know you could also do this:
if (obj1.GetType() == typeof(int))
// Some cod...
8
Solved
We can use a C# typeof keyword when we want to get Type instance for specified type. But what can I use if I want to get MethodInfo of a method by it's reference?
For example I have a simple cons...
Lineup asked 21/2, 2012 at 17:30
27
Solved
In my particular case:
callback instanceof Function
or
typeof callback == "function"
does it even matter, what's the difference?
Additional Resource:
JavaScript-Garden typeof vs instanceof...
Subsistence asked 22/5, 2009 at 19:24
6
Solved
I have the following code:
return "[Inserted new " + typeof(T).ToString() + "]";
But
typeof(T).ToString()
returns the full name including namespace
Is there anyway to just get the class nam...
Talbot asked 3/8, 2010 at 12:12
7
Solved
In R, I'd like to retrieve a list of global variables at the end of my script and iterate over them. Here is my code
#declare a few sample variables
a<-10
b<-"Hello world"
c<-data.frame()...
5
In the following code, copyThing() is written so that its return value has the same type as its argument value:
extern void *copyThingImpl(const void *x);
#define copyThing(x) ((typeof(x)) copyThi...
15
Solved
Is there any way to efficiently check if the variable is Object or Array, in NodeJS & V8?
I'm writing a Model for MongoDB and NodeJS, and to traverse the object tree I need to know if the obj...
Papyrus asked 12/1, 2012 at 11:12
4
Solved
const names = ['jacob', 'master jung', 'kyuhyun'] as const;
type Names = typeof names[number];
I got the results I wanted, but I don't understand typeof names[number].
What does typeof Array[n...
Koal asked 31/12, 2019 at 8:25
9
Solved
I had a perception that, type of a lambda is a function pointer. When I performed following test, I found it to be wrong (demo).
#define LAMBDA [] (int i) -> long { return 0; }
int main ()
{
lo...
7
Solved
I am wondering what the difference is between typeid and typeof in C++. Here's what I know:
typeid is mentioned in the documentation for type_info which is defined in the C++ header file typeinfo...
6
Solved
I have a function I need to pass an object to. I use typeof operator to make a check before processing. But looking at this link, it appears that many javascript instances, such as array or regex, ...
Holzer asked 26/7, 2019 at 21:24
25
Solved
Why is null considered an object in JavaScript?
Is checking
if ( object == null )
Do something
the same as
if ( !object )
Do something
?
And also:
What is the difference between null a...
Bonnet asked 29/4, 2009 at 5:47
3
Solved
I would like to declare a type-enforced array of items and be able to derive a union type from it. This pattern works if you do not explicitly give a type to the items in the array. I am not sure h...
Sierra asked 2/3, 2020 at 20:37
10
Solved
Transpiling via gulp-babel for the server and browserify with babelify for the client - using async and await in my code. These features seem to transform just fine, but...
Error: Cannot find modul...
10
Solved
So i have a function that needs to check if an argument is an object, but this fails because:
typeof [] // returns 'object'
This is a classic javascript gotcha, but i cant remember what to do to...
Sensationalism asked 15/2, 2010 at 12:38
11
Solved
In C++, how does one find the type of a variable?
25
Solved
For example:
int a = 12;
cout << typeof(a) << endl;
Expected output:
int
8
Solved
What's it used for if it always returns object as type?
always for Elements or lists.
Lanthorn asked 24/9, 2010 at 14:13
4
Solved
I have exported a function from some module that looks like:
export function MyFunc<A>() {
return {
foo: (in: A) => void
}
}
Now, in some other module, I want to be able to talk abou...
Deutero asked 24/10, 2018 at 7:55
6
Is there any way that I can discover the type of a variable automatically in C, either through some mechanism within the program itself, or--more likely--through a pre-compilation script that uses ...
1
So from:
export interface Category{
val: string;
icon: string
}
const categoryArray: Category[] = [
{
val: 'business',
icon: 'store'
},
{
val: 'media',
icon: 'video'
},
{
val: 'people',...
Wes asked 13/1, 2022 at 13:56
14
Solved
Is there a better way to get the type of a variable in JS than typeof? It works fine when you do:
> typeof 1
"number"
> typeof "hello"
"string"
But it's useless when you try:
> typeof ...
Bedrail asked 12/9, 2011 at 15:39
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