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
0
votes
3 answers
Implementing a Number System in Java: Mutable vs. Immutable
I am implementing classes for rational numbers, but the problems and issues are essentially the same for complex numbers as well as other classes intended to be used in applications with a significant number of calculations performed on a given…
Ned
- 937
- 6
- 10
0
votes
1 answer
Python Lists append mutable variable
Still new to programming/scripting, and this one's been bothering me. I have a function that searches through a list of names, comparing it to a template list of names, and when it finds a match, it places it in my final list in the correct order.…
CG7Son
- 31
- 3
0
votes
1 answer
Scala unable to change values in mutable Map[Char, Map[Int, Double]] with default values
All maps in this code are mutable maps due to the import statement earlier on in the full code. The nGramGetter.getNGrams(...) method call returns a Map[String, Int].
def train(files: Array[java.io.File]): Map[Char, Map[Int, Double]] = {
val…
user2073068
- 3
- 3
0
votes
2 answers
How to make a method that swaps mutable types? (Natural Numbers) Java
I don't know how the value of an object that is referring to a reference. I am not talking about integers by the way.
I want to make this method.
swapNN(NaturalNumber j, NaturalNumber n)
I want the references of j and n to be swapped but I don't…
user2744298
- 1
- 1
- 1
- 3
0
votes
1 answer
Multiple references in separate lists; Python
I'm trying to basically create references to plot multiple relationships and store them in a list or possibly a dictionary.
Basically:
variable1 = 10
//in this case, 'ref' denotes that the variable should be a reference)
listA = [variable1(ref),…
CodeHard_or_HardCode
- 267
- 1
- 5
- 15
0
votes
4 answers
Any way to make a mutable object derived from an immutable object in C#?
I'm interested in making an immutable class that has properties that cannot be modified, and a mutable class that derives from it. These objects would be simple data objects representing database records, so they would have only immutable values…
Joe Enos
- 39,478
- 11
- 80
- 136
0
votes
2 answers
I need an object that is passed by value and mutable
I am new to C#, so bear with me. I have a problem in c# where I can't decide on whether I need a class or a struct. I'm creating a List of either the class or struct and adding elements to it. If I use a struct, then I can add an item, alter it, and…
Synaps3
- 1,597
- 2
- 15
- 23
0
votes
5 answers
Make a reference immutable?
class Some{
private int id;
private String name;
//getters and setters
}
class Check{
private Some[] someVals;
//getters and setters
}
Assume I have populated values into the someVals in Check class
void newMethod(){
Check checkPrev…
Dinesh Kumar
- 2,838
- 1
- 16
- 18
0
votes
3 answers
Temporary mutability of a member variable
Is it possible to have a member variable only be considered mutable for a given function/code block?
e.g.
class Foo() {
int blah;
void bar() const {
blah = 5; // compiler error
}
void mutable_bar() const {
blah = 5; // no compiler…
Brian
- 2,499
- 3
- 24
- 26
0
votes
1 answer
making an immutable type mutable (consts and boost)
I am working on a feature for a codebase that I cannot change (save for what I'm writing) and there are some types here:
// Pointer to a mutable thingy
typedef boost::shared_ptr MPtr;
// Pointer to an immutable thingy
typedef…
easythrees
- 1,530
- 3
- 16
- 43
0
votes
2 answers
What is the immutable version to de/reference array?
How to de/reference the 3 array variables in this code instead of using mutable values?
The code below computes the Longest common subsequence (LCS) by diagonal traversing the m*n array.
The arguments are 2 char arrays like so:
So LCS method should…
0
votes
3 answers
Are Strings *really* immutable in Java?
Everyone knows that Java's String object is immutable which essentially means that if you take String object a and concatenate it with another String object, say b, a totally new String object is created instead of an inplace concatenation.
However,…
Cemre Mengü
- 18,062
- 27
- 111
- 169
0
votes
1 answer
F# reading csv line by line asynchronously with mutable object
I've read a lot of posts here that help me a lot with my problem, but all my attempts did not bear fruit.
Hear is my code:
first function (Reading file for use line by line)
let readLines filePath = System.IO.File.ReadLines(filePath)
Second…
Anass
- 73
- 4
0
votes
2 answers
How do I accumulate results without using a mutable ArrayBuffer?
The code at the end of this question replaces the zeros with possible numbers ranging from 1 to 9 once and non-repeating. For a given sequence of numbers, List(0, 0, 1, 5, 0, 0, 8, 0, 0), it will returns the following result. There are 720…
thlim
- 2,908
- 3
- 34
- 57
0
votes
1 answer
Array update anomaly in Python
I wrote the following code in python. Within checkd,
when I update d[ii][jj], it seems as if the compiler takes its own liberties and makes all the following column entries to 1.
Code:
def checkd(d, level, a, b):
i = len(b)
j = len(a)
print ['0'] +…
Aditya Gupta
- 11
- 2