Web / ReactJS Interview questions
What is the purpose of render() in React.
Each React component must have a render() mandatorily. It returns a single React element which is the representation of the native DOM component. If more than one HTML element needs to be rendered, then they must be grouped together inside one enclosing tag such as <form>, <group>,<div> etc.
This function must be kept pure i.e., it must return the same result each time it is invoked.
The ReactDOM.render() function takes two arguments, HTML code and an HTML element. The purpose of the function is to display the specified HTML code inside the specified HTML element.
For example, below code display the paragraph inside the "root" element:
ReactDOM.render(<p>Hello</p>, document.getElementById('root'));
The result is displayed in the <div id="root"> element.
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