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Obsessed with React and teaching. I help people become Frontend Developers. Living with my fiancee and Yorkshire Terrier 🐶 in Poland.
Discover Mentorship
The above is an affiliate link, if you buy the book I'll get a small commission at no extra charge to you.
Home/Pills/ Pill - Remove duplicates in JavaScript/
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Remove duplicates in JavaScript

Feb 2, 2021

DESCRIPTION

Clones might take over the world, we - as JavaScript guardians need to learn how to remove duplicates from an array.

Preview

removeDuplicates one-liner

JavaScript

Summary

  • We created removeDuplicates function which accepts an array argument.
  • The above code needs to be read from the right. We're transforming our duplicates array into a new Set. Set is a specific data structure that accepts only unique values.
  • After that, we're getting back to an array, using the Rest spread operator with array syntax, [...].
  • One-liner, clean and modern, one more time: duplicates array -> new Set(array) = only unique values -> [...] spread into an array again = no more clones!
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