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Questions - react-usememo

Passing a value up in react without writing state in parent

What I am trying to do: I need price * quantity = total. I have a table with price as one , quantity as one and total as one . Quantity is a counter and needs to have its own state as rows will be ad...
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mike

javascript

reactjs

jsx

react-props

react-usememo

Votes: 0

Answers: 1

Latest Answer

You should consider productList as "the state" in the parent, instead of counter, and you should have counter as a property of product: // productList [ { id: 123, count...
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kca

Why use useMemo and not useCallback here?

So as i understand the difference between the two is that useCallback is used if a function or object or array is returned while useMemo when a primitive is returned. But i was looking up debouncing (...
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H.b

javascript

reactjs

react-hooks

usecallback

react-usememo

Votes: 0

Answers: 3

Latest Answer

First about your quote: useCallback is used if a function or object or array is returned while useMemo when a primitive is returned No, this is wrong. useCallback is mainly for memoizing functions. ...
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Giorgi Moniava

Render only components with changes

I have an array with thousands of strings and is passed to a component: Main component: const array = ['name1', 'name2', 'name3']; const [names, setNames] = useState(array); const onClick = (index) =...
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Henny Lee

javascript

reactjs

render

usecallback

react-usememo

Votes: 0

Answers: 2

Latest Answer

You have a misunderstanding in the concepts here. The default is for React to call render on all children, regardless of whether the props changed or not. After that happened, React will compare that ...
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Daniel Hilgarth

Memorizing values upon an async call in react

I'm trying to memorize some values in a react component because it's re rendering even when data hasn't changed (and wont change). Using useEffect + useState the data displays correctly, but the funct...
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yieniggu

javascript

reactjs

use-effect

use-state

react-usememo

Votes: 0

Answers: 0

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