ReactJs Performance ~ Memory Leak Prevention ~

Memory leaks can indeed be a significant problem in JavaScript applications, especially when dealing with event listeners, timers, intervals, WebSocket connections, and large object references. Here's an overview of the common types of memory leaks along with examples and detection techniques:

Common Types of Memory Leaks

1. Unremoved Event Listeners

   • Description: When event listeners are added but not removed when they are no longer needed.
   • Example:

     javascript
      
     1useEffect(() => {
     2  document.addEventListener('click', handleClick);
     3  
     4  // Missing return statement to remove the listener
     5  // return () => document.removeEventListener('click', handleClick);
     6}, []);

   • Detection Technique: Use memory profiling tools in Chrome DevTools to inspect event listeners and identify those that are not being removed.

2. Uncleared Timers or Intervals

   • Description: When timers or intervals are set but never cleared.
   • Example:

     javascript
      
     1useEffect(() => {
     2  const intervalId = setInterval(updateState, 1000);
     3  
     4  // Missing return statement to clear the interval
     5  // return () => clearInterval(intervalId);
     6}, []);

   • **Detection Technique

Read the full article at DEV Community

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