[SuperZen]

import React from 'react'

class App extends React.Component {

  constructor(props) {
    super(props)
    this.state = {
      data: []
    }

    this.genData = this.genData.bind(this)
  }

  genData() {
    this.setState(currentData => ({
      ...currentData,
      data: [
        ...currentData.data,
        ...Array
          .from({ length: 10 }, (_, id) =>
            ({
              id: id + this.state.data.length,
              value: Math.random() * 100
            })
          )
      ]
    }))
  }

  componentDidMount() {
    this.genData()
  }

  render() {
    return <React.Fragment>
      {this.state.data.map(({ id, value }) => <div key={id}>{value}</div>)}
      <button onClick={this.genData}>load more</button>
    </React.Fragment>
  }
}
export default App