How can I change value of prop in react?

Question

How to change the value of props, how to setProps, suppose the value of this.props.contact.name is John, I want to change it to Johnny.

How can I do this?

For example:

changeValue(){
  this.props.contact.name='Johnny'
}

Answer 1

I would suggest rather then change the props value you can pass the function into props and then change the parent component state so it will change the child component props like

your Parent Component should be

  class SendData extends React.Component{
  constructor(props) {
    super(props);
     this.state = {
      images: [
        'http://via.placeholder.com/350x150',
        'http://via.placeholder.com/350x151'
      ],
      currentImage: 0
    };
    this.fadeImage=this.fadeImage.bind(this);
  }
  fadeImage(e) {
    e.preventDefault();
    this.setState({currentImage: (this.state.currentImage + 1) % this.state.images.length})
  }
  render()
  {

    return(
      <FadeImage images={this.state.images} currentImage={this.state.currentImage} fadeImage={this.fadeImage}/>
     )
  }
}

your Child Component should be like

    class FadeImage extends React.Component {

  constructor(props) {
    super(props);
  }
  render() {
    return (
            <div className="image">
      <CSSTransitionGroup
        transitionName="example"
        transitionEnterTimeout={300}
        transitionLeaveTimeout={300}
        >
          <section>
            <button className="button" onClick={this.props.fadeImage.bind(this)}>Click!</button>
            <img src={this.props.images[this.props.currentImage]}/></section>
        </CSSTransitionGroup>
        </div>
      );
    }
  }

Please check working example here Demo