operators Questions
4
I have recently come across the code |> in R. It is a vertical line character (pipe) followed by a greater than symbol.
Here is an example:
mtcars |> head()
What is the |> code doing?
15
num = int(input("Please give me a number: "))
print(num)
thou = int((num // 1000))
print(thou)
hun = int((num // 100))
print(hun)
ten =int((num // 10))
print(ten)
one = int((num // 1))
print(one)
...
8
Solved
I'm seeing some odd behaviour after using FirstOrDefault() on a collection of structs. I've isolated it into this reproduction case. This program won't compile
using System;
using System.Linq;
na...
20
What function does the ^ (caret) operator serve in Java?
When I try this:
int a = 5^n;
...it gives me:
for n = 5, returns 0
for n = 4, returns 1
for n = 6, returns 3
...so I guess it do...
Dammar asked 2/1, 2010 at 11:44
3
Solved
I have an object X with a method getY() returning an object Y with a method a(), in typescript.
What does it mean an expression like this one:
X.getY()!.a()
I guess the ! operator is used to che...
Rennes asked 10/8, 2016 at 13:32
5
Solved
Is it possible to implement the ?? operator in Ruby?
a = nil
b = 1
x = a ?? b # x should == 1
x = b ?? 2 # x should == 1
Improvise asked 4/6, 2009 at 21:28
6
Solved
Is there any sort of "not in" operator in JavaScript to check if a property does not exist in an object? I couldn’t find anything about this around Google or Stack Overflow. Here’s a small snippet ...
Yuletide asked 1/11, 2011 at 20:25
3
Solved
How do I call invoke_result correctly for a member function? Or specifically for an operator member function. I tried std::invoke_result<T::operator[], size_type> to no success. What would be...
Pet asked 6/7, 2019 at 0:31
36
Solved
I saw this code:
this.vertical = vertical !== undefined ? !!vertical : this.vertical;
It seems to be using !! as an operator, which I don't recognize. What does it do?
Byelection asked 24/4, 2009 at 8:13
9
Solved
What does the , operator do in C?
Almonte asked 9/9, 2008 at 18:34
4
Solved
In my small project I'm using System.Reflection classes to produce executable code. I need to call the + operator of a custom type. Does anybody know how can I call customized operator of custom cl...
Colangelo asked 20/6, 2012 at 5:22
3
Solved
This raku documentation page says operator ,= is supposed to concatenate
the contents of the variable on the left hand side and the expression on the right hand side
in a class-dependent way....
5
I could not find any notion of OR operator neither in TypeORM docs nor in the source code. does it support it at all?
I'm trying to do perform a basic search with a repository.
db.getRepository(MyM...
Diggins asked 21/11, 2018 at 7:36
3
Solved
Is there no XOR operator for booleans in golang?
I was trying to do something like b1^b2 but it said it wasn't defined for booleans.
Loathsome asked 12/4, 2014 at 3:22
2
Solved
Most programming languages use ~ to represent a unary bitwise-not operation. Go, by contrast, uses ^:
fmt.Println(^1) // Prints -2
Why did the Go designers decide to break with convention here?
...
Hengist asked 25/3, 2016 at 2:15
11
Solved
I've recently (only on SO actually) run into uses of the C/C++ comma operator. From what I can tell, it creates a sequence point on the line between the left and right hand side operators so that y...
11
Solved
I've been attempting to learn C in my spare time, and other languages (C#, Java, etc.) have the same concept (and often the same operators)...
At a core level, what does bit-shifting (<<, >...
Subfamily asked 26/9, 2008 at 19:47
9
Solved
What is the difference between the && and and operators in Ruby?
10
Solved
What's the usage of the tilde operator in Python?
One thing I can think about is do something in both sides of a string or list, such as check if a string is palindromic or not:
def is_palindromi...
4
Solved
In all of the JavaScript operator precedence charts I can find (like this one and this one), the logical AND (&&) has slightly higher precedence to the logical OR (||).
I can't seem to fig...
Cofferdam asked 1/5, 2015 at 10:26
2
Solved
I am attempting to work with an existing library of code but have encountered an issue. In short, I execute a shell script (let's call this one A) whose first act is to call another script (B). Scr...
5
Solved
I am trying to execute a SQlite replace function, but use another field in the function.
select locationname + '<p>' from location;
In this snip, the result is a list of 0s. I would have e...
Cryogenics asked 25/8, 2010 at 17:49
15
Solved
I was playing around in jsfiddle.net and I'm curious as to why this returns true?
if(0 < 5 < 3) {
alert("True");
}
So does this:
if(0 < 5 < 2) {
alert("True");
}
But this doesn'...
Melodee asked 3/11, 2010 at 16:32
7
What does the &= operator mean in Python, and can you give me a working example?
I am trying to understand the __iand__ operator.
I just don't know what &= means and have looked online b...
8
Solved
What is the difference between spread operator and array.concat()
let parts = ['four', 'five'];
let numbers = ['one', 'two', 'three'];
console.log([...numbers, ...parts]);
Array.concat() ...
Invitation asked 19/2, 2018 at 11:57
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