ReactJS - Basic

Why ReactJS?

• Faster and better, thanks to Virtual DOM.
• Can be used on both Client side and server side. - If your app is more of dynamic data, you can go with client side scripting where you need not request the DOM for every change. - Static page can be rendered using server side scripts. - A good mixture of both helps maintain the page safe and efficient.
• Helps to maintain the readability of apps using components which is discussed later. - Can easily update the state by refering the components.

Why JSX?

React uses JSX instead of the regular JavaScript.

Advantages:

• Faster because it performs optimization while compiling code to JavaScript.
• Type-safe and most of the errors can be caught during compilation.
• Easier and faster to write templates, if you are familiar with HTML.

Why JSX?

React uses JSX instead of the regular JavaScript.

Advantages:

• Faster because it performs optimization while compiling code to JavaScript.
• Type-safe and most of the errors can be caught during compilation.
• Easier and faster to write templates, if you are familiar with HTML.

State is an object that determines how the component renders and behaves. It is the place where the data comes from. It allows you to create components that are dynamic and interactive.

• State can be defined as key-value pair defined in each component.
• It can be -- Initialized with this.state -- Updated on event calls.
• When a component's state data changes, the render function will be called again to re-render the change in state using this.setState.

It is not mandatory to use JSX with React. But React would be elegant if JSX is used.

• JSX is an inline markup that looks like HTML that gets transformed to JavaScript.
• It starts with a HTML-like open tag, and ends with the corresponding closing tag.

Example:

 
const element = <h1>Hello, world!</h1>;

The syntax is intended to be used by preprocessors such as Babel to transform HTML-like text into standard JavaScript objects.

Why JSX?

React uses JSX instead of the regular JavaScript.

Advantages:

• Faster because it performs optimization while compiling code to JavaScript.
• Type-safe and most of the errors can be caught during compilation.
• Easier and faster to write templates, if you are familiar with HTML.

State is an object that determines how the component renders and behaves. It is the place where the data comes from. It allows you to create components that are dynamic and interactive.

• State can be defined as key-value pair defined in each component.
• It can be -- Initialized with this.state -- Updated on event calls.
• When a component's state data changes, the render function will be called again to re-render the change in state using this.setState.

State is an object that determines how the component renders and behaves. It is the place where the data comes from. It allows you to create components that are dynamic and interactive.

• State can be defined as key-value pair defined in each component.
• It can be -- Initialized with this.state -- Updated on event calls.
• When a component's state data changes, the render function will be called again to re-render the change in state using this.setState.