Q51. How do you debug a Redux performance problem?
A practical, step-by-step approach: 1. **Confirm it's actually Redux**: use the React DevTools **Profiler** to see which components re-render and how often, before assumi...
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Q52. Why we need to pass a function to setState()?
The reason behind for this is that `setState()` is an asynchronous operation. React batches state changes for performance reasons, so the state may not change immediately...
Q53. Is Node.js completely single threaded?
Node is a single thread, but some of the functions included in the Node.js standard library(e.g, fs module functions) are not single threaded. i.e, Their logic runs outsi...
Q54. Is it good to use arrow functions in render methods?
Yes, You can use. It is often the easiest way to pass parameters to callback functions. But you need to optimize the performance while using it. ```javascript class Foo e...
Q55. How do you solve performance corner cases while using context?
The context uses reference identity to determine when to re-render, there are some gotchas that could trigger unintentional renders in consumers when a provider’s parent ...
Q56. What are the possible reasons for memory leaks?
Memory leaks can lead to poor performance, slow loading times and even crashes in web applications. Some of the common causes of memory leaks are listed below, 1. The exe...
Q57. What is the difference between for loop and forEach?
Both are used to iterate over arrays, but they differ in performance, flexibility, and purpose. The `for` loop is a core JavaScript statement that gives you full control ...
Q58. What are the performance implications of using try-catch in JavaScript?
Try-catch blocks have performance implications, especially when used in hot code paths or when exceptions are frequently thrown. **Performance impact:** ```javascript // ...
Q59. What is the Performance API and how is it used for measuring performance?
The Performance API provides high-precision timing information for measuring web application performance. **Basic timing:** ```javascript // High-resolution timestamp con...