immer | Create the next immutable state by mutating the current one | Frontend Framework library
kandi X-RAY | immer Summary
kandi X-RAY | immer Summary
Winner of the "Breakthrough of the year" React open source award and "Most impactful contribution" JavaScript open source award in 2019.
Support
Quality
Security
License
Reuse
Top functions reviewed by kandi - BETA
Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of immer
immer Key Features
immer Examples and Code Snippets
// 导入相关数据的操作方法并以此进行设置redux
import { actionCreator as homeActionCreator } from '../../views/Home/store'
import { actionCreator as chatActionCreator } from '../../views/Chat/store'
// 导入store以应用dispatch
import store from '../index'
// 导入网络请求方法
import {
import produce, { Draft } from "immer";
const immer =
<
T extends State,
CustomSetState extends SetState = SetState,
CustomGetState extends GetState = GetState,
CustomStoreApi extends StoreApi = StoreApi
>(
config: Stat
import {produce} from 'immer'
const reducer = (state,action)=>{
switch(action.type){
case 'INCREMENT'
return produce(state,draft=>draft.counter++)
case 'SET_VALUE'
return produce(state,draft=>draf
Community Discussions
Trending Discussions on immer
QUESTION
- Combining reducers
ANSWER
Answered 2022-Apr-17 at 07:55Rereading this, I think you just have a misconception.
Stuff is never "saved into a reducer". A reducer only manages how state changes.
In Redux, it would be "saved into the store", but for that you would have to actually use a store. useImmerReducer
has nothing to do with Redux though - it is just a version of useReducer
, which like useState
just manages isolated component-local state with a reducer. This state will not be shared with other components.
If you want to use Redux (and use it with immer), please look into the official Redux Toolkit, which already comes with immer integrated. It is taught by the official Redux tutorial.
QUESTION
I need help with this react-redux code. There is an input field which accept numbers and adds them to the counter above. I want to restart the counter to 0 if the input is not a number, however when I type any char different from int it set the counter to NaN. I tried to cast the value of the state from the reducer and from a separate function but neither worked.
...ANSWER
Answered 2022-Apr-17 at 18:12You should convert value to number before checking if it's NaN:
if (isNaN(Number(add))) {
QUESTION
I am trying to set up my first Gatsby website. After running npm install -g gatsby-cli
, I do gatsby new gatsby-starter-hello-world https://github.com/gatsbyjs/gatsby-starter-hello-world
(just like the website https://www.gatsbyjs.com/starters/gatsbyjs/gatsby-starter-hello-world/ says) to download the hello world starter. When I run gatsby develop
I see the following error
ANSWER
Answered 2022-Mar-21 at 06:34As has been commented in the comments section, the issue has been solved by moving the project folder outside the OneDrive directory.
Because it's a synchronized cloud folder, as soon as you install/add/delete/update anything, it's being updated in the OneDrive cloud so the file/folder it's being used in the background and potentially unreachable. If at this time you try to develop the project (gatsby develop
or gatsby build
) and the file is being used, you won't be able to run it.
I don't think it's a good practice to use a cloud folder because the amount of data synchronized (mainly because of the node_modules
) it's something to care about (it's also ignored in the .gitignore
for a reason) so moving it to any other folder outside the OneDrive directory should be enough to run your project because the rest of global dependencies, according to your logs, were successfully installed.
QUESTION
I want to use this Java program. I extracted the zip and changed in the directory and made the jar executable. Then I run following command
...ANSWER
Answered 2022-Mar-18 at 17:41The classpath separator is only ;
(semicolon) on Windows. Since you're on Linux, you need to be using :
(colon) to separate classpath entries. Your shell is interpreting the semicolon as something totally unrelated and confusing Java.
Just replace all of the semicolons with colons in the command you're invoking.
QUESTION
I'm currently programming a math program. It has the features of starting, then displaying math questions until you answered 10 correctly, and then stopping. It works, but the user can only confirm their answer when they press a button (confirm()
). This is really annoying. I wanted to make it so that it also activates if the user presses enter
while in the entry field.
How to call an event if the user presses enter while their cursor is within the entry field?
...ANSWER
Answered 2022-Mar-17 at 17:36You bind the event to the widget in question.
In the example below, ''
is the key in question, and return_pressed
is the name of the function or method it triggers when the key is pressed.
See this for some more details.
sidenote: you might also want to read up on bind_all
QUESTION
I need help. Im new on coding, so I've developed a game with pygame. It's a game where you fight as a robot against a zombie. If a fireball collides with the zombie, the heart picture will be updated from filled to half and so on.
The Tech-Lead said that this code is not efficient because of the many if statements in the def hearts() method in the Enemy class.
Could you please help me to shorten it? I have absolutely 0 idea what I could do. Thinking about loops, but dont know how to do it. Please help me
Here is my code:
...ANSWER
Answered 2022-Mar-11 at 00:50The tech-lead is wrong: your code is perfectly efficient the way it is written. Making the code shorter does not make it faster or more "elegant".
However, shorter code can be easier to maintain and change. Your code is fine as long as the number of heart containers is always exactly 12. But if you want to change that (to increase/decrease the difficultly of the game, or let the player get new heart containers) then this code won't work. It is hard-coded to work with exactly 12 heart containers only.
To change this, put this repetitive code in a loop. You'll need to look at the pattern of how the numbers change and create a small math formula for it. I've come up with the following. (I've also added constants instead of the integer literals, so that the code is easier to read and change.)
QUESTION
I am "including" a .tex file. I get the error "TeX capacity exceeded, sorry [input stack size=5000].@nomath ...e@font@warning etc." The error is located by latex in the line that says
\pic[current plane, draw,fill=orange!50,fill opacity=.5, text opacity=1,"\footnotesize $\phi$", angle eccentricity=2.2]{angle=ketplus--origin--psiProjectedEquat}; %je nachdem, ob der Psi Pfeil links oder rechts von der z-Achse ist, muss man die Reihenfolge bei "angle=" umkehren }
I should point out that the file that is "included" works when compiled on its own (where the preamble isn't in the masterfile but in the file itself. It seems that the \usepackage[ngerman]{babel}
in the masterfile causes the problem.
MWE:
"file.tex":
...ANSWER
Answered 2022-Mar-03 at 14:56As you've noticed, the combination of your tikz picture and babel causes the problem. You can fix this by loading the babel tikz library:
QUESTION
I have this project, and I have api and through this api, the users in the Database are returned, but in the response, data is returned in addition to two variables, the first “isActive” and the second “isVerified”, and through these two values I can control the display, which means I can control the The data values that will be displayed on the interface,
If the value of the previous two variables is False, it means that the user has been rejected. Therefore, I save the rejected user in the "UsersRequests" array, and then I display the values in the "UsersRequests" array on the interface called "Users Requests"
And if the value of the previous two variables is true, then this means that the user has been accepted and has become a user of the site, so I save the user in the array “Users”, Then I display the values in the "Users" array on the interface called "Users".
And based on the previous cases, I filtered the values coming from the backend
But I got this error:
...ANSWER
Answered 2022-Feb-22 at 08:07In a reducer created with createSlice
, the state
parameter is an Immer draft. Your reducer function must either modify the draft or return a new object, but not both. As you've implemented the reducer, the assignment of the status
and data
properties modify the draft, but then the value produced by state.data.filter
is returned. This causes the error message you're seeing.
Instead, iterate through state.data
and modify the two user properties, but do not explicitly return anything from the function. It might look something like this (extracted to a named function for demonstration):
QUESTION
I am struggling to get the correct regex
for my script. I would like to find all Substrings
in a file
that start with a '
and end with '.tr
. And save all these matches in a list.
This is what Ive got so far:
...ANSWER
Answered 2022-Feb-13 at 10:27You can use
QUESTION
Why does this work:
...ANSWER
Answered 2022-Feb-02 at 12:26Because these are not positional arguments.
initialState
there is a shorthand for
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install immer
Support
Reuse Trending Solutions
Find, review, and download reusable Libraries, Code Snippets, Cloud APIs from over 650 million Knowledge Items
Find more librariesStay Updated
Subscribe to our newsletter for trending solutions and developer bootcamps
Share this Page