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It is destructuring . That is how you destructure from function argument. Router ejects match as one of the props to your Topics component when is rendered. You could have done it like this:

const Topics = (props) => (
    const {match} = props;
    // rest of your codes here
)

But for convenience , ES6 allows you to directly destructure it right from the function argument as you have done above in your code.

const Topics = ({match}) => (
    // rest of your codes here
)