Kurt Mueller EverybodyKurts

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React.memo, React.useCallback, React.useMemo

Normally, function components are rerendered every time the application renders. If you have large/complex components, this can affect application performance.

You can use React.memo, React.useCallback, and React.useMemo to memoize parts of your application. This means that React will cache and reuse their previous results instead of rerendering them.

Example:

We start with a useReducer-based Counter application, with the following additions:

	import SwiftUI

	struct Person: Identifiable {
	let id = UUID()

	var firstName: String
	var lastName: String
	}

	struct PersonField: View {

	module DragDropPage

	open Feliz
	open Fable.React
	open Fable.React.Props
	open ReactDND

	type Language = {
	Name: string
	}