Mutation refers to a genetic operator used to maintain genetic diversity from one generation of a population to the next. For javascript DOM, use [mutation-observers]. For Java mutators, use [mutators]. For object mutability in general, use [mutability].
Questions tagged [mutation]
430 questions
15
votes
3 answers
Replace array item with another one without mutating state
This is how example of my state looks:
const INITIAL_STATE = {
contents: [ {}, {}, {}, etc.. ],
meta: {}
}
I need to be able and somehow replace an item inside contents array knowing its index, I have tried:
return {
...state,
…
Ilja
- 35,872
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15
votes
6 answers
Remove data from nested objects without mutating
Is there any elegant way of removing an object from an array which is part of an array?
I have been working with React and Redux for a while now but get stuck several hours everytime I have to remove or insert data without mutating the state.
The…
Daniel Storch
- 907
- 2
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- 24
15
votes
5 answers
applying crossover and mutation to a graph (genetic algorithm)
I'm playing arround with a Genetic Algorithm in which I want to evolve graphs.
Do you know a way to apply crossover and mutation when the chromosomes are graphs?
Or am I missing a coding for the graphs that let me apply "regular" crossover and…
Manuel Araoz
- 14,795
- 21
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14
votes
0 answers
How to calculate the number of mutants in a quite simple Fortran-77 Program
Next week I will make a presentation about mutation test in my class. The professor give me the paper An Experimental Determination of Sufficient Mutant Operators, written by A. Jefferson Offutt et.al. From the paper, I can get a conclusion that the…
machinarium
- 581
- 5
- 16
10
votes
3 answers
Why do we need to avoid mutations while coding? What is a mutation?
Why is the second code (the one with the stream) a better solution than the first?
First :
public static void main(String [] args) {
List values = Arrays.asList(1,2,3,4,5,6);
int total = 0;
for(int e : values) {
total += e *…
codeme
- 591
- 1
- 9
- 26
9
votes
2 answers
How to pass variables in mutation graphQL Playground?
I am using apollo express server 2.0. And I am trying to execute mutation in the graphql playground. Here is the mutation I have attached a screenshot with another screenshot of a variable.
I am getting the following error when I am trying to…
Piyush Bansal
- 1,219
- 1
- 12
- 34
9
votes
1 answer
PTTest is failing and not generating mutation coverage
I want to generate mutation test coverage. I am doing POC on PI Test
but it is not taking my test classes and failing. I have configured PTTest plugin in pom.xml. I checked the target class package name and target test class package name are correct…
Prithvipal Singh
- 462
- 2
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- 20
8
votes
3 answers
Python difference between mutating and re-assigning a list ( _list = and _list[:] = )
So I frequently write code following a pattern like this:
_list = list(range(10)) # Or whatever
_list = [some_function(x) for x in _list]
_list = [some_other_function(x) for x in _list]
etc
I saw now on a different question a comment that explained…
Neil
- 2,116
- 2
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8
votes
1 answer
Why doesn't MutationObserver code run on Chrome 30?
From http://updates.html5rocks.com/2012/02/Detect-DOM-changes-with-Mutation-Observers I got the following code:
var insertedNodes = [];
var observer = new WebKitMutationObserver(function(mutations) {
alert('run');
…
weilou
- 3,869
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8
votes
1 answer
How do I save and change the value of a variable in OCaml?
This may be a very newbie question, but I didn't find the answer.
I need to store, for example a list and later replace it with another, under the same pointer.
EBM
- 939
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- 18
7
votes
1 answer
mutate() got multiple values for argument 'name'
I want to query createThemes to my graphql.
My graphql query is:
mutation{
createTheme(name: "qwe"){
theme{
id
}
}
}
So it errors: mutate() got multiple values for argument 'name' Can you solve and explain why its printing such…
user10763646
7
votes
2 answers
What are the ways to avoid object mutation in Dart-lang?
If we take the following snippet as an example:
main() {
List array = [1, 2, 3, 4];
List newArray = change(array);
print(array); // [99, 2, 3, 4]
print(newArray); // [99, 2, 3, 4]
print(newArray == array); //…
Mohamed Hayibor
- 113
- 4
7
votes
2 answers
Why don't lazy languages support mutation?
I'm studying programming language theory and I can't figure out a solid reason why lazy languages don't have mutation. Anyone know the reason?
forellana
- 877
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6
votes
3 answers
How can a genetic algorithm optimize a neural network's weights without knowing the search volume?
I've implemented a genetic algorithm trained neural network with a mutation operator like so:
def mutation(chromosome, mutation_rate):
for gene in chromosome:
if random.uniform(0.00, 1.00) <= mutation_rate:
gene = random.uniform(-1.00,…
gator
- 3,225
- 6
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- 66
6
votes
2 answers
Vuex/Vuejs: accessing localStorage within vuex store
I am using localStorage to set and get items, which is placed within my javascript code in a .vue file. However, I would like to somehow access that storage and place it within my Vuex store section which is in another file, most preferably within…
Aadil Hafesji
- 311
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