Ronald Ruzicka ronaldruzicka

Frontend Developer

ronaldruzicka / usePrevious.ts

Last active February 5, 2021 16:07

React hook to use previous value in Typescript

	import { useRef, useEffect } from 'react'

	/**
	* Saves previous value, if you need to compare it to a current value
	* @param value - anything you need to store as a previous value
	*/
	export const usePrevious = <T>(value: T) => {
	const ref = useRef<T>()

	// Store current value in ref

ronaldruzicka / accordion-context.tsx

Last active February 9, 2021 08:21

Example of simple React context in Typescript

 import { createContext, useContext, useState } from 'react';
 type Props = {
   children: React.ReactNode | React.ReactNode[];
 };
 type Context = {
   isExpanded: boolean;
   toggleItem?: () => void;
 };

ronaldruzicka / user-context.tsx

Last active February 9, 2021 08:57

Example of separated React context for state and updater function for better performance in Typescript

 import { createContext, useContext, useState } from 'react'
 type User = {
   firstName: string
   lastName: string
   email: string
 }
 type Updater = (user: User) => void