All Questions
208
questions
-1
votes
2
answers
156
views
Is Observable's "viewof" really an operator? [closed]
I'm confused by Observable's use of the word "operator" in their documentation, and wondering whether they have misused it, or I'm simply not understanding.
Observable has a special viewof ...
- 122k
0
votes
0
answers
80
views
What is the <:0:> operator in c++? [duplicate]
I recently found a strange operator in the c++ codebase of my company. There it is:
// make the output visible on the console
std::cout.rdbuf()<:0:>.pubsync();
What does the "<:...
- 11
0
votes
2
answers
93
views
Define ternary inline operator in F#
I want to define an infix operator |>> which works like this:
i |>> f1 f2 is the same as (f1 i, f2 i)
i.e. it will apply an argument onto two functions and concatenate the results.
Best ...
0
votes
2
answers
44
views
Correct operator usage
I'm using IPUMS CPS data and created a binary variable for disability from the six different variables within IPUMS for disability (https://cps.ipums.org/cps-action/variables/group/core_dis)
bias <-...
- 5
0
votes
1
answer
66
views
What is the name of R Special Backtick and Parentheses Syntax?
I have recently encountered the following R syntax:
(`::`("ggplot","aes"))()
or
(`$`(mylist,"column"))
I understand what it does, but I struggle to find any ...
- 25
0
votes
1
answer
52
views
MySQL: Is there an operator to identify unique values?
I want to update the column 'status' in a dataframe 'Enrollments' that references another 'visitID' column, but I want the values within 'status' to be as follows:
When there are 2 or more Id's that ...
- 11
1
vote
2
answers
91
views
Understanding how the "is" operator works int Python for result from function
For example we have this code.
x = 1
y = 1
print(x is y) # TRUE
print(id(x), id(y))
y = pow(10, 30, 10**30-1) # 1
print(type(y))
print(x, y, x is y) # FALSE
It`s return:
True
140516304938720 ...
- 13
0
votes
1
answer
49
views
Why am I getting the same value of x (-2147483648) irrespective of the different values of a, b and c I input?
#include <stdio.h>
#include <math.h>
int main() {
// Write C code here
int a;
int b;
int c;
printf("Input the values of a,b and c:\n");
scanf("%...
-1
votes
1
answer
102
views
What's the benefit of 3-ways comparison operator (<=>) in C++20?
I know the syntax of it.
I just wondering what's the benefit or whether does it make sens.
Without it, we must code like this:
void func1(int x, int y) {
if( x > y )
doSomeThing();
...
- 1,997
0
votes
1
answer
46
views
Can I assign an ALIAS to a help option?
In R, the I believe the core features such as "+" or "?" are called "operators" (they are I believe in most programming languages: an operator as a symbol to perform a ...
- 973
1
vote
1
answer
210
views
is it possible to assign multiple values after initalization within curly braces?
When creating an instance, you can specify all the member values within curly braces.
Is there a syntax that allows you to specify multiple value changes using the curly braces after it's already ...
- 6,169
0
votes
2
answers
216
views
How does spread operator work in Flutter?
I am following a Flutter tutorial that I can't understand this part:
class CartItem {
final String id;
final String title;
final int quantity;
final double price;
CartItem({
required ...
- 600
0
votes
1
answer
468
views
Is "foo === bar" equal to "if (foo === bar) {return true}"? [duplicate]
I know this question falls in the realm of "basics", however I'd like to understand the inner workings of the language.
My question is:
Do operators 'return' the expression's value by ...
-1
votes
1
answer
2k
views
What does "null!" default value of property mean?
I have seen this below code in somewhere. There is a TodoItems property in the TodoContext class and it has a default value of "null!". I know this is a default value set for intended ...
- 123
1
vote
3
answers
728
views
Ternary operator, shortcut to return checked condition if true?
I am looking to see if there is an even-shorter notation for an already relatively compact notation. It seems like some piece of syntax that would exist for a fairly common pattern in code.
Here, the ...
