A mutable can be modified after it is created.
A mutable can be modified after it is created. It is a keyword in functional programming opposite to immutable.
Related tags:
Questions tagged [mutable]
1184 questions
-1
votes
1 answer
How to avoid arg kwargs to be non mutable?
I have a class A
class A:
__dict__ = {"x": 0}
def __init__(self, **kwargs):
self.__dict__.update(kwargs.copy())
When I create A objects:
>>> a = A(x=2)
>>> b = A(x=3)
>>> print(a.__dict__)
{x: 3}
>>> print(b.__dict__)
{x: 3}
When I preset…
Just_Me
- 111
- 8
-1
votes
2 answers
How to run two setTimeout tasks in parallel?
I'm reading YDKJS and early on we are talking about the difference between Async, Parallel and Concurrent Code.
I have a simple Async example:
let output = 0;
const bar = (cb) => setTimeout(cb, Math.random() * 1000);
const foo = (cb) =>…
Armeen Moon
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-1
votes
2 answers
Unable to swap multiple elements in a list in python
I'm new to python and am trying to make a function that swaps multiple values in a list at once.
def swap(deck: List[int], start1: int, end1: int, start2: int, end2: int) -> None:
start1 = start1 % len(deck)
start2 = start2 % len(deck)
…
JPJW
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- 1
-1
votes
2 answers
Does Python automatically update variables whose value is another object?
Before asking, I read the accepted answer to the question "How do I pass a variable by reference?" and documentation linked in that same answer: "How do I write a function with output parameters (call by reference)?"
I have a related question: Does…
Joachim Rives
- 471
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- 19
-1
votes
4 answers
How can I check if there is a duplicate list in a list of lists?
I have a list RESULT that contains lists. I want to add a list to RESULT only if it does not exist.
So
input = [1,2,3]
RESULT = [[5,6], [4,5,8]]
Now, RESULT.append(input) that gives
RESULT = [[5,6], [4,5,8], [1,2,3]]
Now if I try to append [5,6]…
Atihska
- 4,803
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- 98
-1
votes
4 answers
Why isn't the value of the list changing even after I modify its value inside the function?
We know that lists in Python are mutable objects. However, the following code does not change the value of the list whose value is being modified inside a function.
def change(l):
l=l[2:5]
return()
l=[1,3,4,5,2,10]
change(l)
print (l)
I…
cherryWood55
- 1
- 2
-1
votes
1 answer
Why does StringBuffer return a reference?
public class doubleSum {
private static String calculate(String a, String b){
String[] a_parts = a.split("\\.");
String[] b_parts = b.split("\\.");
StringBuffer sb = new StringBuffer();
int[] carrier = new…
Soliloquyyyyy_
- 3
- 3
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votes
2 answers
Add Tuple3 to a mutable Set in Scala
I have already looked at adding tuples to a Set in scala but nothing seems to work in my case
val mySet = mutable.HashSet[(String, String, String)]
val myTuple = ("hi", "hello", "there")
mySet ++= myTuple
mySet += myTuple // Expects String…
yalkris
- 2,596
- 5
- 31
- 51
-1
votes
2 answers
I heard that Haskell variables are immutable but i am able to reassign and update variable values
I heard that Haskell variables are immutable but i am able to reassign and update variable values
saketh
- 317
- 2
- 10
-1
votes
1 answer
How do I implement move semantics on a struct with a mutable field?
I have a minimal example of code that implements move semantics for some container:
use std::mem;
impl<'a, T: 'a + ?Sized> Drop for Cointainer<'a, T> {
fn drop(&mut self) {}
}
struct Cointainer<'a, T: 'a + ?Sized> {
item: &'a /* mut */…
LOST
- 2,956
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- 40
-1
votes
2 answers
How to make copy of MutableList in Kotlin?
So, I just started out with Kotlin and tried to solve "min steps for a knight to reach a destination on a chessboard" problem.
Here is my code:
fun knightSteps(i:Int,j:Int,a:Int,b:Int,board:Int,c :Int,d:Int,visited :…
SATHWIK MATSA
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- 6
-1
votes
3 answers
Python Class with ctypes attributes has side effects
I create a class for an image buffer. The class looks like this:
import ctypes
class ImgBuf():
def __init__(self, bufnr=ctypes.c_int(-1)):
self.bufnr = bufnr
The attribute 'bufnr' is handed over to a shared library by reference and…
smiddy84
- 285
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-1
votes
1 answer
Using dicts as attributes in Python 3
Consider the following code in Python 3.5.2:
class NewObj():
def __init__(self, refs={}):
self.refs = refs
class ObjA(NewObj):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
class ObjB(NewObj):
…
Charlie
- 469
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-1
votes
2 answers
How to merge mutating numbers of lists into one in Python Speech Recognition?
I want to merge mutable lists into one. I am using speech recognition, so the lists of words that I am getting are changing all the time. Some people said to add lists using the + operator, but every time the speaker speaks, various numbers of lists…
mathimatika
- 11
- 3
-1
votes
2 answers
How to create an empty mutable list in python, so that list item can be added later?
I want to create an empty list in python so that I can add items into it later by a function. But when I tried to add items into it through function it showed me "TypeError: Can't convert 'tuple' object to str implicitly". Why am getting this?
page…
Anshul Bansal
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