react hook 实现use-watch

import { useEffect, useRef } from 'react';
const defaultCompare = (prev, next) => prev === next;
export const useWatch = (
  callback,
  value,
  { initialValue = '', compare = defaultCompare } = {},
) => {
  const prevValue = useRef(initialValue);
  const safeEffects = useRef([]);
  const prev = prevValue.current;
  if (!compare(prev, value)) {
    const safeEffect =
      callback === null || callback === void 0 ? void 0 : callback(prev);
    if (typeof safeEffect === 'function') {
      safeEffects.current.push(safeEffect);
    }
    prevValue.current = value;
  }
  useEffect(() => {
    safeEffects.current.forEach((safeEffect) => safeEffect());
    safeEffects.current = [];
  });
};

export default useWatch;

标签：current,use,const,callback,safeEffect,react,hook,safeEffects,prev
来源： https://www.cnblogs.com/ygunoil/p/16479186.html