An example of the old React mixin API

mixin-example.jsx

import React from 'react';

// numberBehaviour.js
const numberBehaviour = {  
  getInitialState() {
    return {
      newNumber: 1
    }
  },
  setNewNumber(num) {
    this.setState({
      newNumber: num
    })
  }
}

// logger.js
const logger = {  
  logNumber(number) {
    console.log(number)
  }
}

// MyComponent.jsx
const MyComponent = React.createClass({
  mixins: [
    numberBehaviour,
    logger
  ],
  render() {
    return <p>{this.state.newNumber}</p>
  },
  someStaticMethod(num) {
    this.setNewNumber(num)
    this.logNumber(num)
  }
})