Memory management is about how JavaScript uses and releases memory while your program runs.
If memory is not handled properly, applications can become slow, freeze, or even crash.
This usually happens because of memory leaks — when memory is used but never released.
Understanding memory management helps developers build fast, stable, and reliable JavaScript applications.
Common Causes of Memory Leaks
- Unused variables kept in memory
- Forgotten event listeners
- Timers that never stop
- Large objects stored unnecessarily
- Closures holding unwanted references
Avoiding these problems improves both performance and stability.
Here, the interval keeps running forever.
If this code is inside a page or component that is removed, memory will still be used.
By stopping the timer when it is no longer needed, memory is released properly.
This is a simple but very important habit in professional development.
These examples show how small mistakes can lead to memory leaks.
By learning proper memory management, students gain the ability to build efficient, stable, and professional JavaScript applications that run smoothly even for long periods of time.