removeclass in react code example

Example: remove class react

You can make use of the state to store the active div and then conditionally add active class to it

class Hello extends React.component{
  state = {
    active: ''
  }
  addActiveClass(e){
      const clicked = e.target.id
      if(this.state.active === clicked) { 
          this.setState({active: ''});
      } else {
          this.setState({active: clicked})
     }
  }

  render() {
     return (
   <div>
<div className={`red green blue ${this.state.active === "first"? 'active': ''}`} id="first" onClick={this.addActiveClass}>Hello World</div>
<div className={`red green blue ${this.state.active === "second"? 'active': ''}`} id="second" onClick={this.addActiveClass}>Good Bye World</div>
  </div>
     )
  }
}