What is callback hell?
Callback hell describes deeply nested callback-based asynchronous code that becomes difficult to read, maintain, test, and handle errors in. It often occurs when multiple dependent asynchronous operations are nested inside each other. Promises, async/await, modular functions, and better control-flow design can reduce this problem.
Key Takeaways
- Callback hell is mainly a code-structure problem.
- Promises can flatten asynchronous control flow.
- async/await can make dependent operations easier to read.
Knowledge Check
Which approach commonly helps reduce callback hell?