Array#Extras Course

Because working with collections is fun

A free email-based course to learn JS Array functions


map, filter, some, and reduce  — the essentials to work with collections


They are Javascript's way of saying "Hey, 2010's long passed, let's add the functions virtually all other languages have for ages"


They are a definite level-up from for and while loops


And finally, you'll be able to understand the code you write even after a week

14 emails


One every day, for two weeks straight


With plenty of click-to-try examples, short exercises, and case studies


  map, filter, some, and reduce


Present in every Array, supported by all modern browsers


Using Java, Swift, Ruby, or something else? Learn the concepts once and find the same functions in all these languages

Level up your game

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