Answers for "defaultprops react"

default props react

// ES6 class
class CatComponent extends React.Component {    
  constructor(props) {}    
  render() {        
    return <div>{this.props.catName} Cat, 
      Eye Color: {this.props.eyeColor }, 
        Age: {this.props.age}</div>    
  }
}
CatComponent.defaultProps = {    
  catName: "Sandy",    
  eyeColor: "deepblue",    
  age: "120"
}

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 proptypes

import PropTypes from 'prop-types';

class Greeting extends React.Component {
  render() {
    return (
      <h1>Hello, {this.props.name}</h1>
    );
  }
}

Greeting.propTypes = {
  name: PropTypes.string
};

proptypes.arrayof/()

optionalArrayOf: PropTypes.arrayOf(PropTypes.number)