onClick not working React js

If your build system has support for babel, Use ES6 arrow functions in your react code.

If you are using ES6 class for creating components, use method binding at the constructor level to avoid binding at every render call and also provide a key to the div tag inside the map function.

class Test extends React.Component {
    constructor(props) {
        super(props);
        this.btnTapped = this
            .btnTapped
            .bind(this);
    }
    btnTapped() {
        console.log('tapped');
    }
    render() {

        return (
            <div>
                {this
                    .props
                    .stations
                    .map((station, index) => {
                        return <div key={index} onClick={this.btnTapped}>{station}</div>
                    })
                }
            </div>
        )
    }
}

var cards = ["amazon", "aeo", "aerie", "barnes", "bloomingdales", "bbw", "bestbuy", "regal", "cvs", "ebay", "gyft", "itunes", "jcp", "panera", "staples", "walmart", "target", "sephora", "walgreens", "starbucks"];

    
ReactDOM.render(
    <Test stations={cards}/>, document.getElementById('test-div'));
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>
<body>
  <div id="test-div"></div>
</body>

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