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
1 answer
Edit a variable without editing the origin
I need to copy a variable and make changes to it.
I've alredy seen this, but i want the oposite.
In this code i need the returned tuple to be two different lists, not the same.
def getIPRange(self):
group = [0, self.getJoinedNetworks() - 1]
…
gcq
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votes
2 answers
Attempt to mutate immutable object error
My code crashes at this line:
[(NSMutableString *)string replaceCharactersInRange:range withString:@""];
with the error attempt to mutate immutable object.
How is this happening and how do i fix it?
Alex
- 451
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- 13
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votes
2 answers
Add code to block dynamically
I'm pretty new to using blocks. I'm wondering if there is a way to add code dynamically to a block? A mutable block if you will.
Peter Warbo
- 11,136
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2 answers
Modifying an instance of string
I have a string:
str="D\\projects\\myown\\java"
I assigned this string to two variables like:
str1=str
str2=str
After I did the below operation:
idgb1=str1.gsub!("\\","_")
I get str1 as D_projects_myown_java and str2 is the same. why does this…
ѕтƒ
- 3,547
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votes
1 answer
Extracting elements from STArray (similar to unzipping)
I'm having a slight problem implementing a particle based fluid simulation in Haskell for a programming competition. I currently have an array of particles that gets modified at each simulation step. Each particle is a tuple of 2 vectors: position…
Sebastian Göb
- 53
- 5
0
votes
2 answers
mutable field with overloaded assignment operator
I have a C++ class field that is declared mutable. When it was of type double, I could modify it in a const method with no problem. But when I switched its type to a class in which operator= is overloaded, I got the error that this overloaded…
user410315
- 696
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- 8
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votes
2 answers
Modifying a hash with multiple occurrences
a is a hash. s is an array where I want to push the hash a iteratively. The idea is to retain the value of each iteratively pushed hash independently. Here is what I tried.
a = {:a=> 1, :b=>2}
s = []
s << a
s << a # => [{:b=>2, :a=>1}, {:b=>2,…
Saurajeet
- 1,088
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votes
2 answers
Priority Queue and Mutability
>>> import Queue
>>> q = Queue.PriorityQueue()
>>> a = (1, {'item': 'value'})
>>> q.put(a)
>>> q.queue
[(1, {'item': 'value'})]
>>> a[1]['count'] = 1
>>> q.queue
[(1, {'count': 1, 'item': 'value'})]
>>> q.get()
(1, {'count': 1, 'item':…
Bharathwaaj
- 2,627
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1 answer
FP modelling - Mutability issue
I am about to start a simulation/modelling project.
Let's say I have a component of type A, characterised by a set of data (a parameter like temperature or pressure,a PDE and some boundary conditions,etc.) and a component of type B, characterised by…
heaptobesquare
- 29
- 3
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votes
4 answers
How to change one item in dictionary
I need a function to change one item in composite dictionary.
I've tried something like..
def SetItem(keys, value):
item = self.dict
for key in keys:
item = item[key]
item = value
and
SetItem(['key1', 'key2'],…
Meloun
- 13,601
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0
votes
3 answers
Problems drawing a bitmap on a layout
I create the Layout programatically in onCreate:
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
myView = new MyView(SketchActivity.this, layout.getWidth(), layout.getHeight());
…
rosu alin
- 5,674
- 11
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- 150
0
votes
2 answers
Generate a list of distinct empty mutables
I need to initialize a list of defaultdicts. If they were, say, strings, this would be tidy:
list_of_dds = [string] * n
…but for mutables, you get right into a mess with that approach:
>>> x=[defaultdict(list)] * 3
>>> x[0]['foo'] = 'bar'
>>>…
kojiro
- 74,557
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votes
1 answer
Can someone explain these programming terms: reference semantics, non-linear mutable state?
Can you explain these terms for me: reference semantics and value semantics (and how they contrast) and non-linear mutable state. They are mentioned in the comments to the book review in this link
http://lambda-the-ultimate.org/node/2849
The book is…
Ali
- 21
- 3
0
votes
1 answer
F# Mutable Array & Basic Classes Not Behaving As Expected in Unit Testing
I am trying to learn F# and have started to play around with a couple of simple classes, but these are not quite behaving as expected.
I must be misunderstanding some simple fundamental. Apologies if this question is too basic, but any help would…
posfr
- 11
- 2
0
votes
1 answer
Draw on Bitmap in dependency to screen size
I am working with two other people on a Android project (2.2) for my studies.
We want to show maps of some university buildings so you canf find rooms easier. We use a custom ImageView (TouchImageView).
I make the bitmap mutable with
plant =…
Dominik
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