All Questions
Tagged with variable-assignment reference
83 questions
3
votes
1
answer
113
views
PHP variable as reference
I'm confused about the concept of variable in PHP.
As far as I know, a variable in PHP has a name ($p) and a value ('Carlo').
$p has an associated entry in symbol table, such an entry actually points ...
- 313
0
votes
0
answers
27
views
Referring to the variable being assigned to on the right side of the assignment operator
Sometimes it may be necessary (yes, likely against best practices) to deal with nested objects, such as lists, which can require multi-level indexation. I am curious of the following:
1. In Python, is ...
4
votes
5
answers
303
views
Why does "setf" not work when using "let"?
The behavior of setf when combined with let is confusing to me. Here, setf isn't changing the second value of my list.
(defun to-temp-field (lst)
(let ((old-value (nth 2 lst))
(new-value '...
- 119
0
votes
2
answers
44
views
Why are the results different depending on how to assign?
When I tried to reverse the Linked list, I noticed that the results varied depending on how I did the assignments.
Why does it happen as bellow?
class ListNode:
def __init__(self, val=0, next: ...
0
votes
1
answer
21
views
Error with referencing a variable before assignment python
I have a for loop as part of a larger function:
for table in tables_list:
if table["file"] == file:
table_name = table["table_name"]
break
log.info(f"table: {...
- 81
0
votes
1
answer
357
views
Why can't Kotlin variables assigned from fields change in function?
I'm trying to understand why can't a variable that is assigned from a class field change in a function. Consider this example:
class A {
private var a: String? = "a"
fun hello() {
...
0
votes
2
answers
78
views
C# Generic variable changes if another same type generic changes
I've this class:
public class Pair<T, V>
{
public T A = default;
public V B = default;
public Pair()
{
A = default;
B = default;
}
public Pair(T a, V b)
...
- 1,324
1
vote
0
answers
66
views
Is conditionally setting a value by ref correct?
I wanted to know if it is ok to assign a value by ref like this?
Merger A = Merger();
// if Condition is true, B references to A, otherwise a different Merger.
Merger& B = Condition ? A : Merger()...
- 19.2k
1
vote
1
answer
80
views
Confused with references on pointers in C++
The task is to calculate the output of the following source code without a computer, which I would say is "123 234 678 678" because ref1 is a reference on the value of ptr and in the moment ...
- 37
-2
votes
1
answer
1k
views
pass by reference or by value in variable assignment of struct, Golang
type temp struct{
val int
}
variable1 := temp{val:5} // 1
variable2 := &temp{val:6} // 2
In 2, the reference is stored in the variable2.
In 1, does the copy operation is taking place? Or ...
- 23
0
votes
1
answer
452
views
Assign values from list to specific values in a list of dictionaries
I have list of values:
list = [value1, value2, value3]
And a list of dictionaries where on specific keys I must set the corresponding values:
dictionaries = [{"key1":{"key2":{&...
- 151
0
votes
1
answer
547
views
Pass by reference vs Pass by assignment? C# vs Python
I am working concurrently in C# and in Python.
Is there a difference, in terms of what is being created in memory, between passing a reference type in C#, and passing (by assignment) in Python? It ...
- 1,112
0
votes
1
answer
210
views
Pass in vs assign const reference in C++
const string& x = functionA();
functionB(x); // depends on x is string or const string&
string str = x;
We have const ref x:
Pass into functionB, so basically we make a copy of the value of x ...
- 8,848
0
votes
1
answer
243
views
How can I reference a list initialized in a function? (Python)
The error I'm receiving is local variable 'actions' referenced before assignment. I have a feeling that this is because I am creating the list within the function and then trying to reference it ...
- 57
0
votes
1
answer
2k
views
How to change object value in a loop in Dart
I'm a total newbie in Dart and I've a lot of issues trying to change a member value of an Object inside a loop.
I've my object so defined:
class Cell {
int magicnum, x, y;
Cell(this.magicnum);
...
- 77