Ramda JS Tutorial – Part 26 (countBy)

770 views · Published 19 October 2018 · 17:49 · Indexed 3 October 2026

Channel: Christopher Okhravi · 2018 · Education

Watch on YouTube

Count the number of different elements in a list by passing a single identity transformer to the Ramda function countBy. We'll also talk briefly about transducers in this video.

Let's understand all the functions of the JavaScript library Ramda JS and learn a lot about functional programming as we go along.

⭐️ Support the channel on Patreon:
https://www.patreon.com/christopherokhravi

👾 In this video:
R.countBy

🖥 Full playlist:
https://www.youtube.com/playlist?list=PLrhzvIcii6GMeyUfpn-o5xVCH3_UykrzI

More from this channel

• 15:13 Big Think Strategy: How to Leverage Bold Ideas | Books for Mastery

  Christopher Okhravi

  1,852 views · 13 April 2015

• 5:03 Why functional programs parallelise better | Code Walks 007

  Christopher Okhravi

  4,003 views · 16 July 2016

• 2:40 The SCAM part of Integration tests | Code Walks 026

  Christopher Okhravi

  1,928 views · 26 July 2016

• 3:20 Replace foreach with map | Code Walks 031

  Christopher Okhravi

  3,563 views · 6 September 2016

• 14:38 Ramda JS Tutorial – Part 12 (both, flip)

  Christopher Okhravi

  1,384 views · 25 February 2018

• 9:33 Ramda JS Tutorial – Part 16 (clone)

  Christopher Okhravi

  1,104 views · 20 April 2018

• 22:26 How To Write Just Enough Tests? – Questions and Answers #3

  Christopher Okhravi

  3,009 views · 13 May 2018

• 49:09 Build IoT apps with OO Design Patterns? Questions & Answers #6

  Christopher Okhravi

  4,039 views · 21 October 2018