Answers for "prototype in react js"

proptypes oneof

import PropTypes from 'prop-types';

MyComponent.propTypes = {
  // You can declare that a prop is a specific JS type. By default, these
  // are all optional.
  optionalArray: PropTypes.array,
  optionalBool: PropTypes.bool,
  optionalFunc: PropTypes.func,
  optionalNumber: PropTypes.number,
  optionalObject: PropTypes.object,
  optionalString: PropTypes.string,
  optionalSymbol: PropTypes.symbol,

  // An object that could be one of many types
  optionalUnion: PropTypes.oneOfType([
    PropTypes.string,
    PropTypes.number,
    PropTypes.instanceOf(Message)
  ])
};

react propthpes or

size: PropTypes.oneOfType([
  PropTypes.string,
  PropTypes.number
]),

react prototype function

<button onClick={this.handleClick}>

react prototype function

class Foo extends Component {
  handleClick() {
    console.log('Clicado');
  }
  render() {
    return <button onClick={this.handleClick.bind(this)}>Clique em mim!</button>;
  }
}