reactify
Converts plain functions into reactive functions. The converted function accepts refs as its arguments and returns a ComputedRef, with proper typing.
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Usage
Basic example
import { reactify } from '@vueuse/core'
// a plain function
function add(a: number, b: number): number {
return a + b
}
// now it accept refs and returns a computed ref
// (a: number | Ref<number>, b: number | Ref<number>) => ComputedRef<number>
const reactiveAdd = reactify(add)
const a = ref(1)
const b = ref(2)
const sum = reactiveAdd(a, b)
console.log(sum.value) // 3
a.value = 5
console.log(sum.value) // 7
import { reactify } from '@vueuse/core'
// a plain function
function add(a: number, b: number): number {
return a + b
}
// now it accept refs and returns a computed ref
// (a: number | Ref<number>, b: number | Ref<number>) => ComputedRef<number>
const reactiveAdd = reactify(add)
const a = ref(1)
const b = ref(2)
const sum = reactiveAdd(a, b)
console.log(sum.value) // 3
a.value = 5
console.log(sum.value) // 7
An example of implementing a reactive Pythagorean theorem.
import { reactify } from '@vueuse/core'
const pow = reactify(Math.pow)
const sqrt = reactify(Math.sqrt)
const add = reactify((a: number, b: number) => a + b)
const a = ref(3)
const b = ref(4)
const c = sqrt(add(pow(a, 2), pow(b, 2)))
console.log(c.value) // 5
// 5:12:13
a.value = 5
b.value = 12
console.log(c.value) // 13
import { reactify } from '@vueuse/core'
const pow = reactify(Math.pow)
const sqrt = reactify(Math.sqrt)
const add = reactify((a: number, b: number) => a + b)
const a = ref(3)
const b = ref(4)
const c = sqrt(add(pow(a, 2), pow(b, 2)))
console.log(c.value) // 5
// 5:12:13
a.value = 5
b.value = 12
console.log(c.value) // 13
You can also do it this way:
import { reactify } from '@vueuse/core'
function pythagorean(a: number, b: number) {
return Math.sqrt(a ** 2 + b ** 2)
}
const a = ref(3)
const b = ref(4)
const c = reactify(pythagorean)(a, b)
console.log(c.value) // 5
import { reactify } from '@vueuse/core'
function pythagorean(a: number, b: number) {
return Math.sqrt(a ** 2 + b ** 2)
}
const a = ref(3)
const b = ref(4)
const c = reactify(pythagorean)(a, b)
console.log(c.value) // 5
Another example of making reactive stringify
import { reactify } from '@vueuse/core'
const stringify = reactify(JSON.stringify)
const obj = ref(42)
const dumped = stringify(obj)
console.log(dumped.value) // '42'
obj.value = { foo: 'bar' }
console.log(dumped.value) // '{"foo":"bar"}'
import { reactify } from '@vueuse/core'
const stringify = reactify(JSON.stringify)
const obj = ref(42)
const dumped = stringify(obj)
console.log(dumped.value) // '42'
obj.value = { foo: 'bar' }
console.log(dumped.value) // '{"foo":"bar"}'
Type Declarations
export declare type Reactify<T> = T extends (...args: infer A) => infer R
? (
...args: {
[K in keyof A]: MaybeRef<A[K]>
}
) => ComputedRef<R>
: never
/**
* Converts plain function into a reactive function.
* The converted function accepts refs as it's arguments
* and returns a ComputedRef, with proper typing.
*
* @param fn - Source function
*/
export declare function reactify<T extends Function>(fn: T): Reactify<T>
export { reactify as createReactiveFn }
export declare type Reactify<T> = T extends (...args: infer A) => infer R
? (
...args: {
[K in keyof A]: MaybeRef<A[K]>
}
) => ComputedRef<R>
: never
/**
* Converts plain function into a reactive function.
* The converted function accepts refs as it's arguments
* and returns a ComputedRef, with proper typing.
*
* @param fn - Source function
*/
export declare function reactify<T extends Function>(fn: T): Reactify<T>
export { reactify as createReactiveFn }
Source
Contributors
Anthony Fu
ordago