Q11. What is the purpose of the array splice method?
The `splice()` method in JavaScript is used to add, remove, or replace elements within an array. Unlike `slice()`, which creates a shallow copy and does not alter the ori...
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Q12. When to use a Class Component over a Function Component?
After the addition of Hooks(i.e. React 16.8 onwards) it is always recommended to use Function components over Class components in React. Because you could use state, life...
Q13. What is the difference between slice and splice?
Here are the key differences between `slice()` and `splice()` methods in JavaScript arrays: | `slice()` | `splice()` | | -------------------------------------------------...
Q14. What are Pure Components?
Pure components are the components which render the same output for the same state and props. In function components, you can achieve these pure components through memoiz...
Q15. How do you compare Object and Map?
**Objects** and **Maps** both allow you to associate keys with values, retrieve those values, delete keys, and check if a key exists. Historically, Objects have been used...
Q16. What is state in React?
_State_ of a component is an object that holds some information that may change over the lifetime of the component. The important point is whenever the state object chang...
Q17. What is the difference between == and === operators?
JavaScript provides two types of equality operators: - **Loose equality (`==`, `!=`)**: Performs type conversion if the types differ, comparing values after converting th...
Q18. What are props in React?
_Props_ are inputs to components. They are single values or objects containing a set of values that are passed to components on creation similar to HTML-tag attributes. H...
Q19. What are lambda expressions or arrow functions?
**Arrow functions** (also known as "lambda expressions") provide a concise syntax for writing function expressions in JavaScript. Introduced in ES6, arrow functions are o...
Q20. What is the difference between state and props?
In React, both **state** and **props** are plain JavaScript objects, but they serve different purposes and have distinct behaviors: ### State - **Definition:** State is a...