Function useCounter

react-unit-test/src/useCounter.ts:9–22

(initialCount: number = 0)

];

export default function useCounter(initialCount: number = 0): UseCounterReturnType {
  
  const [count, setCount] = useState(initialCount);

  const increment = (delta: number) => {
    setCount(count => count + delta);
  };

  const decrement = (delta: number) => {
    setCount(count => count - delta);
  };

  return [count, increment, decrement];
}