useUnit Hook

Using the ActiveJS is similar to RxJS Observables and other observable and subscription-based libraries.

However, if you don't want to create a useState and useEffect binding every time you use a Unit, you can create a custom Hook for using ActiveJS Units, and pass the Unit to useUnit Hook to bind the Unit with your React component.

useUnit Hook:

TypeScript
JavaScript
TypeScript
import { useState, useEffect } from "react";
import { UnitBase } from "@activejs/core";
const bind = <T extends Function>(method: T, thisArg: any): T =>
method.bind(thisArg)
export type UnitValueType<T> = T extends UnitBase<infer X> ? X : never
export function useUnit<U extends UnitBase<any>>(unit: U) {
type T = UnitValueType<U>
const [value, setValue] = useState<T>()
useEffect(() => {
const subscription = unit.subscribe(setValue);
return () => subscription.unsubscribe();
}, [])
return {
value,
dispatch: bind(unit.dispatch, unit),
resetValue: bind(unit.resetValue, unit)
}
}
JavaScript
import { useState, useEffect } from 'react'
import { UnitBase } from '@activejs/core'
export const useUnit = (unit) => {
const [value, setValue] = useState()
useEffect(() => {
const subscription = unit.subscribe(setValue)
return () => subscription.unsubscribe()
}, []);
const dispatch = v => unit.dispatch(v)
const resetValue = () => unit.resetValue()
return {value, dispatch, resetValue}
}

Examples:

  • See this for basic usage.