1 line of code: How to clean an Array of "falsy" items

const cleanFalsy = arr => arr.filter(Boolean);

Optimised version:

const cleanFalsy = arr => arr.filter(i=>i);

Returns a new array without all items which are considered to be "false" (0, '', Nan, false, undefined, null).

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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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Comments

[Jon Randy 🎖️]

const cleanFalsy = arr => arr.filter(i=>i)

This is almost twice as fast on Firefox. On Chrome, the two methods are similarly efficient with i=>i being ever so slightly quicker. Performance link

I guess this is because allowing the internal Boolean coercion to do its thing is faster than explicitly doing it yourself.

[Martin Krause]

Thank you for the effort of setting up the performance comparison and sharing with us. I amended he article on updated the code.

Cheers!