usePrevious

Category

Export Size

260 B

Last Changed

2 weeks ago

Holds the previous value of a ref.

Usage

import { ref } from 'vue'
import { usePrevious } from '@vueuse/core'

const counter = ref('Hello')
const previous = usePrevious(counter)

console.log(previous.value) // undefined

counter.value = 'World'

console.log(previous.value) // Hello

Type Declarations

/**
 * Holds the previous value of a ref.
 *
 * @see   {@link https://vueuse.org/usePrevious}
 */
export declare function usePrevious<T>(
  value: MaybeRefOrGetter<T>
): Readonly<Ref<T | undefined>>
export declare function usePrevious<T>(
  value: MaybeRefOrGetter<T>,
  initialValue: T
): Readonly<Ref<T>>

Source

Source • Docs

© 2019-present Anthony Fu
Licensed under the MIT License.
https://vueuse.org/core/usePrevious/