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
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)
  }
}
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.
Last modified 2yr ago