shallowequal | ️ Like lodash v3.x isEqualWith
kandi X-RAY | shallowequal Summary
kandi X-RAY | shallowequal Summary
shallowequal is like lodash's isEqual (v3.10.1) but for shallow (strict) equal. Performs a shallow equality comparison between two values (i.e. value and other) to determine if they are equivalent.
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Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of shallowequal
shallowequal Key Features
shallowequal Examples and Code Snippets
const { accounts, isLoading } = useSelector(
(state: RootState) => state.accounts,
shallowEqual
)
const { accounts, isAccountsLoading } = useSelector(
(state: RootState) => ({
accounts: state.accoun
const curriedSelector = state => () => 0;
let renders = 0;
const Component = () => {
// Returns a new function each time
// triggers a new render each time
const value = useSelector(curriedSelector)();
return `Value ${val
Community Discussions
Trending Discussions on shallowequal
QUESTION
I'm trying to display products using the fetched axios result from reducer, but the useSelector value just won't change and is still empty even after dispatch. I have checked the axios result and the response has correct data. Does it have something to do with this line on redux documentation?
With useSelector(), returning a new object every time will always force a re-render by default.
reducer
...ANSWER
Answered 2022-Jan-27 at 16:50You should first create your action
QUESTION
I am using react
and redux toolkit
with redux-persist
. When making an http
request in useEffect
it causes the component to re-render infinite times even the data doesn't change, so the problem is in useSelector
, I have even tried shallowEqual
function and also without strict mode, but it doesn't work.
ANSWER
Answered 2021-Dec-20 at 15:14This has nothing to do with Redux at all.
Your infinite loop is caused by setProducts(response.data);
in combination with the dependency array.
Your useEffect
has products
as a dependency, so if products
changes it will make a new request to the server - and after that request set those products will be a new object, even if that object has the same contents. So the dependency changes, which triggers a new cycle of the useEffect
.
QUESTION
I'm having an Ant Design
which have onChange events. If the onChange event function is true I'm displaying extra content.
So in the example sandbox I created, when changing all the the
to Yes it fires the onChange event which is validated and then showing a div with the text "You checked all answered with yes".
As I'm using
it is a form controlled environment so I'm using form
to set and reset values. But when calling form.resetFields()
the onChange handlers are not called. So the message won't go away as the state not refreshes. So I have to find a way to call a function from the parent component which refreshes the form values in the child component.
Using useImperativeHandle()
for every field to update on more complex forms to call functions from the parent seems way too complex for such a simple task. And adding custom events to communicate with parent components seem to be a not very react way when reading this stack overflow thread
Is there something from the Ant Design form I'm missing? Because this must be a common task. What's a good way to approach this problem?
Link to code sandbox with an example:
https://codesandbox.io/s/vigilant-curran-dqvlc?file=/src/AntDFormChild.js
Example
...ANSWER
Answered 2021-Dec-01 at 17:31Since AntD Form is uncontrolled, there is no way to trigger onChange
event by calling resetFields
, setFieldsValues
.
I think your goal is to show the message depending on form values, and the best way to do is to use Form.Item
, which can access form state.
https://codesandbox.io/s/antd-form-item-based-on-other-item-ens59?file=/src/AntDFormChild.js
QUESTION
I have table component with tableRows stored in useState.
Also I have searcher component outside of table component.
When data inside of searcher changes, tableRows updates inside useEffect.
And it works good, but it causes two rerender. And i understand why. First rerender because of useSelector, and the second because useEffect have useSelector value as dependency.
But how to avoid one rerender. I want it to rerenders when tableRows changes, but not when searcher changes.
...ANSWER
Answered 2021-Nov-20 at 15:12One of the possible solutions is memoization:
QUESTION
I'm using react-headroom for this project and needed to edit its code so the
yarn add
and then normally import it as any other library:
...ANSWER
Answered 2021-Oct-29 at 13:35You have forgotten to build your forked library with the build
command.
So, build it:
QUESTION
I have this code snipet that i grap the count from the store..
...ANSWER
Answered 2021-Oct-13 at 13:56As you are returning primitive value from selector so it won't make a difference if you use shallowCopy or not, by default it compares through strict === reference equality check
you can use shallowEquals
when you select an object that might be similar in contents but different by reference.
for e.g
QUESTION
I met a error on using a useFormik for typescript, can anybody help? Thanks a lot.
In line const value = formik.values[field.name];
, I am getting this error:
Element implicitly has an 'any' type because expression of type 'string' can't be used to index type '{ name: string; description: string; color: string; }'.
ANSWER
Answered 2021-Aug-19 at 19:34You can specify fields
as a literal value with a const
assertion.
QUESTION
As per Doc
...ANSWER
Answered 2021-May-04 at 11:51In your example, it does not make a difference.
shallowEquals
makes sense when you select an object that might be similar in contents, but different by reference.
See these two objects:
QUESTION
I am using react-native-tab-view
, and trying to change the indicator width. I would like indicator width
to be the same with the tab text
. But What I did is just the default. I have tried in many ways, but always it gave me the wrong result. The tab bar should be scrollable horizontally as well. Could you check which part I should change?
ShowAllIndex Code :
...ANSWER
Answered 2021-Mar-11 at 10:34I think the prop indicatorStyle
in TabBar that can resolves you problem.
QUESTION
Following custom hooks as state selector and using that within "functional View" component. Now, I need to use that in redux Saga function. Can we use that into Saga function or I have to use some other approach instead of using custom hooks into Saga function ?
...ANSWER
Answered 2021-Mar-23 at 23:37Instead of defining these as custom hooks, define them as selectors instead. Redux selectors may be freely shared between multiple different use-cases.
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