ReactJS - Keys

Keys avail React identify which items have transmuted, are integrated, or are abstracted. Keys should be given to the elements inside the array to give the elements a stable identity.


Example:

 


import React from 'react';

class App extends React.Component {
    constructor() {
        super();

        this.state = {
            data: [
                {
                    language: 'Java....',
                    id: 1
                },
                {
                    language: 'C....',
                    id: 2
                },
                {
                    language: 'C++....',
                    id: 3
                },
                {
                    language: 'GO....',
                    id: 4
                }
            ]
        }
    }
    render() {
        return (
            <div  class="container">
                <div>
                    {this.state.data.map((dynamicComponent, i) =>
                     <Content key={i} componentData={dynamicComponent} />)}
                </div>
            </div>
        );
    }
}
class Content extends React.Component {
    render() {
        return (
            <div>
                <div>{this.props.componentData.language}</div>
                <div>{this.props.componentData.id}</div>
            </div>
        );
    }
}
export default App;

CRUD

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