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Cover image for 1 line of code: How to get the closest numeric item of an Array
martin krause
martin krause

Posted on • Updated on

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) ); 
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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.


Follow me on Twitter: @martinkr and consider to buy me a coffee

Photo by zoo_monkey on Unsplash


Top comments (3)

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jfbrennan profile image
Jordan Brennan

I'm liking this series, but your code samples need some syntax highlighting. Add "javascript" after the opening backticks

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martinkr profile image
martin krause Author

Thank you for you suggestion.
I'm wondering how I could forget about this!? I'll update the articles.

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jonrandy profile image
Jon Randy

The code feels awfully inefficient on a first read

Classic DEV Post from 2020:

js visualized

πŸš€βš™οΈ JavaScript Visualized: the JavaScript Engine

As JavaScript devs, we usually don't have to deal with compilers ourselves. However, it's definitely good to know the basics of the JavaScript engine and see how it handles our human-friendly JS code, and turns it into something machines understand! πŸ₯³

Happy coding!