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]
557 questions
23
votes
2 answers
GraphQL error: Cannot query field 'mutation_name' on type 'Mutation'
I am trying to mutate a mutation. The mutation does exist and works fine on my graphql playground. but as I implement it in my react component, I get error. Queries work fine though. By the way, I need client in my code so I definitely have to use…
Anita
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16
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
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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
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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
- 631
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14
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
- 979
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- 25
13
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
- 1,635
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- 39
12
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
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- 29
11
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
- 383
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- 23
11
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
- 511
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10
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
- 1,067
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9
votes
3 answers
Mutate across multiple columns to create new variable sets
I have a panel dataset at the country and year level, and I'd like to create a two new variables based on existing ones.
year
country
var1
var2
var3
var…
PierreRoubaix
- 167
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9
votes
5 answers
React query mutation: getting the response from the server with onError callback when the API call fails
I am working on a React JS project. In my project, I am using React query, https://react-query.tanstack.com/docs/guides/mutations. I am using mutation to make the post request to the server. But I am trying the get the response returns from the…
Wai Yan Hein
- 13,651
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9
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
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8
votes
1 answer
React RTK query Mutation can return value?
Is is possible to get the response of endpoint in React RTK Query Mutation .
I have a one mutation which insert into DB and I need to get the ID which inserted. in my api :
addRecord: build.mutation({
query(data) {
return {
…
Reza Rahgozar
- 99
- 1
- 7
8
votes
2 answers
vuex unknown local mutation type: updateValue, global type: app/updateValue. Mutations don't work
I want to apply mutations through actions to a variable in my vuejs application. But I get this error saying [vuex] unknown local mutation type: updateValue, global type: app/updateValue
Here is my store folder structure:
-store
-modules
…
seyet
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