Q1. 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...
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Q2. What is the order of Angular lifecycle hooks?
Angular calls lifecycle hooks in a defined order. The constructor runs first and should only inject dependencies. Then ngOnChanges fires whenever a bound input changes, b...
Q3. How do you model a long-running operation in REST?
Do not hold the connection open. Instead accept the work and return 202 Accepted with a pointer to a status resource. ```http POST /reports Location: /reports/jobs/789 Re...
Q4. What are stateful components?
If the behaviour of a component is dependent on the _state_ of the component then it can be termed as stateful component. These _stateful components_ are either function ...
Q5. Do Hooks replace render props and higher order components?
Both render props and higher-order components render only a single child but in most of the cases Hooks are a simpler way to serve this by reducing nesting in your tree.
Q6. What are hooks?
Hooks is a special JavaScript function that allows you use state and other React features without writing a class. This pattern has been introduced as a new feature in Re...
Q7. What rules need to be followed for hooks?
You need to follow two rules in order to use hooks, 1. **Call Hooks only at the top level of your react functions:** You should always use hooks at the top level of react...
Q8. How to ensure hooks followed the rules in your project?
React team released an ESLint plugin called **eslint-plugin-react-hooks** that enforces Hook's two rules. It is part of Hooks API. You can add this plugin to your project...
Q9. Do I need to rewrite all my class components with hooks?
No. But you can try Hooks in a few components(or new components) without rewriting any existing code. Because there are no plans to remove classes in ReactJS.
Q10. What is useEffect hook? How to fetch data with React Hooks?
The `useEffect` hook is a React Hook that lets you perform **side effects** in function components. Side effects are operations that interact with the outside world or sy...