useCounter

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A hook that allows to manage a counter.

Example

Demo Code

import useCounter from "@/hooks/useCounter";

export default function UseCounterExample() {
  const { count, setCount, increment, decrement, reset } = useCounter(0);

  return (
    <div className="flex flex-col items-center justify-center gap-4 p-4 text-ctp-text">
      <p>Count: {count}</p>
      <button
        className="rounded bg-ctp-green px-4 py-2 text-ctp-base"
        onClick={() => increment()}
      >
        Increment
      </button>
      <button
        className="rounded bg-ctp-red px-4 py-2 text-ctp-base"
        onClick={() => decrement()}
      >
        Decrement
      </button>
      <button
        className="rounded bg-ctp-yellow px-4 py-2 text-ctp-base"
        onClick={() => reset()}
      >
        Reset
      </button>
      <button
        className="rounded bg-ctp-blue px-4 py-2 text-ctp-base"
        onClick={() => setCount(10)}
      >
        Set to 10
      </button>
    </div>
  );
}

Code

import { useCallback, useState } from "react";

import type { Dispatch, SetStateAction } from "react";

type UseCounterReturn = {
  count: number;
  increment: () => void;
  decrement: () => void;
  reset: () => void;
  setCount: Dispatch<SetStateAction<number>>;
};

/**
 * A hook that allows to manage a counter.
 * @param {number} initialValue - The initial value of the counter.
 * @returns {UseCounterReturn} An object with the following properties:
 * 1. count - The current value of the counter.
 * 2. increment - A function to increment the counter.
 * 3. decrement - A function to decrement the counter.
 * 4. reset - A function to reset the counter to its initial value.
 * 5. setCount - A function to set the counter value.
 */
export default function useCounter(initialValue?: number): UseCounterReturn {
  const [count, setCount] = useState(initialValue ?? 0);

  const increment = useCallback(() => {
    setCount((x) => x + 1);
  }, []);

  const decrement = useCallback(() => {
    setCount((x) => x - 1);
  }, []);

  const reset = useCallback(() => {
    setCount(initialValue ?? 0);
  }, [initialValue]);

  return {
    count,
    increment,
    decrement,
    reset,
    setCount,
  };
}