Preface to ReactJS
1. What’s ReactJS?
2. What are the crucial features of ReactJS?
ReactJS has several crucial features that make it a popular choice for structure stoner interfaces
element– grounded armature
Unidirectional data inflow
3. What’s JSX?
4. What’s the difference between a functional element and a class element?
5. What’s the purpose of state in ReactJS?
6. What are props in ReactJS?
Props( short for parcels) are used to pass data from a parent element to a child element. They’re inflexible, meaning that they can not be changed by the child element. Props are used to customize the geste and appearance of factors.
7. What’s the part of the virtual DOM in ReactJS?
The virtual DOM is a featherlight dupe of the real DOM. ReactJS uses the virtual DOM to compare the current state of the stoner interface with the former state. By only streamlining the corridor of the stoner interface that have changed, ReactJS improves the performance and effectiveness of the operation.
8. How does ReactJS handle events?
In ReactJS, events are handled using event instructors. Event instructors are functions that are touched off when a specific event occurs, similar as a button click or a form submission. ReactJS provides a set of erected– in event instructors that can be used to handle common events.
9. What’s the significance of keys in ReactJS?
Keys are used to uniquely identify rudiments in a list of factors. They help ReactJS identify which particulars have changed, been added, or been removed from the list. Keys are important for performance optimization and should be unique among siblings, but not inescapably encyclopedically unique.
10. How can you optimize the performance of ReactJS operations?
There are several ways to optimize the performance of ReactJS operations
Use the virtual DOM to minimize DOM updates
Avoid gratuitousre-renders by using shouldComponentUpdate orReact.memo
Use keys to optimize picture of lists
Splitting large factors into lower, applicable factors
Use law splitting and lazy lading to load factors on demand