A child component is a React component created and designed to be used as a sub-component of another parent component.
Child components are often used when the parent component is not reusable. Using it in any other context would break the parent's behaviour and cause errors.
This video shows child components, when they should be used, and how they work with other React components. It also talks about some common mistakes developers make while using them and some best practices for their usage.
Reasons to Re-evaluate your Child Components in React
A child component is a React component which has been created and designed to be used as a sub-component of another parent component. It can help developers reuse code by providing functionalities specific to a given use case. For example, a button is often a child component of a form which can be used to submit the form.
Re-evaluating your child components in React can help you avoid common problems in your code by thinking about how they are used and their responsibilities.
Reasons to Re-evaluate your Child Components in React:
- It's easy to fall into the trap of unnecessarily re-rendering a component when you don't need to change anything.
- It's easy to forget that components have lifecycle methods and that these methods should be called at appropriate times for clean, maintainable code.
Benefits of Re-Evaluating Your Child Component in React
The benefit of re-evaluating your child component in React is that it will make your code more reusable and maintainable.
You don't need to worry about managing state and lifecycle methods as well as the props. In fact, you don't even need to know what a lifecycle method is.
React has a lot of different components that you can use for various purposes. For example, if you want to create a component that renders a list of items, you can use the List Component or the Grid Component, which are both parts of React's core library.
See More
import React from 'react'; function App() { function refreshPage() { window. location. reload(false); } return (
React is a JavaScript library for building user interfaces. It has become one of the most popular libraries in the industry. However, it is often criticized for being too complex and difficult to use.
We have to re-evaluate our component code more often because the components are changing constantly, and we need to make sure they are still relevant. This process is tedious, time-consuming, and expensive.
The child component is a React component that wraps an existing component to provide additional functionality. It is also known as the child container.
The primary purpose of the child component is to provide a new interface for the parent component. The child container offers functionalities not available to the parent, such as event handlers and state management, while still allowing the parent to access and manipulate its own data.
The role of the child component can be seen in three different ways:
- It can contain data from a parent that it needs to be able to use (e.g., state, props)
- It can have functionality that doesn't exist within its parent but would be useful for it (e.g., event handlers)
- It can contain additional components for which it provides a container and a lifecycle.
The child component is the most fundamental component in React. It just renders the props passed to it. But, with the new Context API, we can now use this component to get data from a parent component in a more structured way. The idea of re-evaluating the child component is to make it more flexible and easier to use in our applications.
The benefits of re-evaluating the child component are that it makes our application more flexible and easier to maintain. With this change, one can also avoid some common mistakes that developers make with this particular part of an application.
If you are trying to re-render a child component from the parent component, you should use the render prop function. The render prop function allows you to use the props that the parent component has passed down to update and render a child component.
When you have a child component rendered by a parent component, the child component needs to be re-rendered on each change in the parent component. For example, this happens when the child component changes its HTML or CSS. In such cases, we need to use React's re-rendering functions to ensure that the changes are reflected in the DOM. React provides two ways of doing this - ref and useRef.
The state of a React component is an object with key-value pairs representing the properties and values that change over time. It is important to note that these values are not just immutable but also unchangeable as well.
The parent component is a React component that renders all the child components. When the state of the parent changes, all the child components are rerendered.
This makes it easy for developers to update their applications without worrying about other components getting out of sync with their changes.
On the contrary, state changes in child components do not affect the parent component. This is because a child component is only responsible for rendering its own state and not the state of its parent.
React components are the building blocks of your app. They can be used to create complex apps with a lot of functionality and animations. The state of a component is stored in its props; whenever there is a change, it will automatically re-render itself.
An update to the application's state is a simple action that can cause all the UI elements to be re-rendered. This is a common practice in React code. However, there may be some instances where the Render() method depends on some additional data.
There are many ways to check if a component is re-rendered in React.
The most popular method is to use the PureRenderMixin. This allows us to render our components without any props or state change, and it will always return the same result.
Another way is to use ReactDOM.findDOMNode() method will give us access to the DOM node of the rendered React element. We can then compare it with an earlier DOM node using diffing methods like setState() or deepEqual().
We can also use ReactDOM.render() method and compare two render objects with each other, but that's not recommended because this method uses setState().
Learner's Ratings
4.4
Overall Rating
73%
11%
8%
1%
7%
Reviews
M
Mohanlal Khhurana
5
Very helpful course in learning ReactJS
S
Syed manzoor ali
5
I gave it 5 stars for their work. Topics are covered very well.but one thing which I would like to say to the teachers that you covered very good but try to cover more things and use less English words. Except this all things are best.
A
Aditya
5
Amazing content.
S
Sonkar Singh
4
This series is usefull for just starting and building confident. Go further and explore more about React JS
S
Sumit Kumar
5
Fake reviews
M
Mahaveer kumar kirshanani
5
amazing mam , keep going
R
Rakeh
5
nice
A
Anshul Bhai
5
This is very helpful
Y
yash sheliya
5
My explaining in learnvern was good. Thank you for Learn Vern to all teachers
Share a personalized message with your friends.