REACT Missing “key” prop for element

https://stackoverflow.com/questions/48266018/missing-key-prop-for-element-reactjs-and-typescript

When rendering an array of elements, React needs a key prop (1) to identify elements and optimize things.

Add key={topic.id} to your element in jsx:

return (
    <div>
        <h2>Results List</h2>
        {topics.map((topic: any) =>
            <div className="panel panel-default" key={topic.id}>
                <div className="panel-heading">{topic.name}</div>
                <div className="panel-body">{topic.description}</div>
            </div>
        )}
    </div>
);