1 line of code: How to get the closest numeric item of an Array

const closestNumber = (arr, number) => arr.reduce((acc, current) => (Math.abs(current - number) < Math.abs(acc - number) ? current : acc) ); 

Returns the numerical item closest to the given number.

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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