ClassProperties.js

import React, { Component, PropTypes } from 'react'

export default class extends Component {
  static propTypes = {
    onReady: PropTypes.func.isRequired
  }

  users = [
    { id: 1, name: '1' },
    { id: 2, name: '2' },
    { id: 3, name: '3' },
    { id: 4, name: '4' }
  ];

  componentDidMount() {
    this.props.onReady()
  }

  render() {
    return (
      <div id="feature-class-properties">
        {this.users.map(user => (
          <div key={user.id}>{user.name}</div>
        ))}
      </div>
    );
  }
}