Documents / @faasjs/react / usePrevious

Function: usePrevious()

usePrevious<T>(value): T | undefined

Hook to store the previous value of a state or prop.

Type Parameters

T

T = any

The type of the value.

Parameters

value

T

The current value to track.

Returns

T | undefined

Previous value from the prior render, or undefined on the first render.

Example

import { usePrevious } from '@faasjs/react'

function Counter({ count }: { count: number }) {
  const previous = usePrevious(count)

  return <span>{previous} -> {count}</span>
}