class Feed extends React.Component { constructor(props) { super(props) this.handleShowMore = this.handleShowMore.bind(this) this.state = { items: [`Item A`, `Item B`, `Item C`, `Item D`], showItems: 2 } } handleShowMore() { this.setState({ showItems: this.state.showItems >= this.state.items.length ? this.state.showItems : this.state.showItems + 1 }) } render() { const items = this.state.items.slice(0, this.state.showItems).map( (item) => {item} ) return ( <div> {items} <button onClick={this.handleShowMore}> Show more! </button> </div> ) } } ReactDOM.render( , document.getElementById(`root`) ) ©