1 line of code: How to get every n-th item of an Array

const nthItems = (arr, pos) => arr.filter((arr, index) => index % pos === pos - 1);

Returns all items which are at the n-th-position.

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Optimised code (Benchmark)

const nthItems = Array.from({ length: ~~(arr.length / pos) }, (_, i) => arr[(i + 1) * pos - 1])

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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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Photo by zoo_monkey on Unsplash

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Comments

[Jon Randy 🎖️]

This method is hundreds of times faster...

const nthItems = (arr, pos) => Array.from({length:~~(arr.length/pos)}, (_,i)=>arr[(i+1)*pos-1])

[Martin Krause]

Amazing, thank you.

I updated the article and the code.

Cheers!