1 line of code: How to sort an array by descending order

const sortDesc = arr =>  [...arr].sort((a, b) => a - b).reverse();

Returns a new array sorted by ascending (Numbers).
Beware of JavaScript's Automatic Type Conversion if your Array contains something else than Numbers.

Optimised Code

const sortDesc = arr =>  [...arr].sort((a, b) => b - a);

The repository & npm package

You can find the all the utility functions from this series at github.com/martinkr/onelinecode
The library is also published to npm as @onelinecode for your convenience.

The code and the npm package will be updated every time I publish a new article.

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