state
usePrevious
Returns the value from the previous render. Useful for comparing old and new state or detecting direction of change.
usePrevious.ts
import { useRef, useEffect } from "react"
export function usePrevious<T>(value: T): T | undefined {
const ref = useRef<T | undefined>(undefined)
useEffect(() => {
ref.current = value
})
return ref.current
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