useCounter()

1import { Dispatch, SetStateAction, useState } from 'react'
2
3interface ReturnType {
4  count: number
5  increment: () => void
6  decrement: () => void
7  reset: () => void
8  setCount: Dispatch<SetStateAction<number>>
9}
10
11function useCounter(initialValue?: number): ReturnType {
12  const [count, setCount] = useState(initialValue || 0)
13
14  const increment = () => setCount(x => x + 1)
15  const decrement = () => setCount(x => x - 1)
16  const reset = () => setCount(initialValue || 0)
17
18  return {
19    count,
20    increment,
21    decrement,
22    reset,
23    setCount,
24  }
25}
26
27export default useCounter

1import { useCounter } from 'usehooks-ts'
2
3export default function Component() {
4  const { count, setCount, increment, decrement, reset } = useCounter(0)
5
6  const multiplyBy2 = () => setCount((x: number) => x * 2)
7
8  return (
9    <>
10      <p>Count is {count}</p>
11      <button onClick={increment}>Increment</button>
12      <button onClick={decrement}>Decrement</button>
13      <button onClick={reset}>Reset</button>
14      <button onClick={multiplyBy2}>Multiply by 2</button>
15    </>
16  )
17}