Are there other methods of automatic memory management besides G1 Garbage Collector?

React.memo is a Higher Order Component (HOC) that memoizes a functional component, preventing it from re-rendering if the props haven't changed. This helps optimize performance, especially for heavy components.

Example:

const MyComponent = React.memo(function MyComponent(props) {
  // component will only re-render if props change
  return <div>{props.value}</div>;
});

useCallback is a hook that memoizes a function, returning the same function reference between renders if dependencies haven't changed. This is useful when passing functions to child components to prevent unnecessary re-renders.

Example:

const memoizedCallback = useCallback(() => {
  doSomething(a, b);
}, [a, b]);

It is used when you need to pass a callback to an optimized child component (for example, wrapped in React.memo) to avoid unnecessary updates due to changes in the function reference.