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Discovering Functors, Monads, and Applicatives


Discovering Functors, Monads, and Applicatives

This session has ended. But you can still sign up for this course at the 47 Degrees Academy.

Perhaps, before your Haskell journey started, you heard of “functors” and “monads”. What are they? Do Haskellers really use them as often as it seems?

This workshop takes you on a journey from simple examples (lists, trees, optionals) to the more generic ideas. The goal of this workshop is to develop your intuition about what functors, monads, and applicatives are and the main use cases for each of them.

The workshop provides not only explanations, but also exercises for you to follow along. The rough schedule is as follows:

  • Me: From maps to functors
  • You: Write Functor instances for trees and functions
  • Me: Combinators for the happy path of Maybe
  • Me: Simulating stateful computations
  • You: Writing some functions using our combinators
  • Me: Discovering monads from those examples
  • Me: Do notation
  • You: Write Functor instances for functions
  • You: Write some monadic utilities
  • Me: Applicative as generalizing map to n-ary functions
  • You: Rewrite your monadic utilities using applicatives

A Q&A session will immediately follow this workshop.

Enroll for $230Starts on July 30 at 4 PM CET

Company and Private Group Training


Alejandro Serrano

Alejandro Serrano

Lead Software Engineer


  • Haskell
  • Functor
  • Monad
  • Applicative
  • Higher-Kinded Type
  • Type Constructor.

This Webinar includes:

  • Small Class Size
  • Q&A Session
  • Access to Slides
  • Access to Academy EduTools Platform
  • Materials and Code
  • Access to the Academy Slack


  • Basic Haskell knowledge including data types
  • pattern matching
  • and simple type classes.

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Is this course 100% online?


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No, at this time, the courses are not intended to replace university or other formal education courses. If you are an academic or training institution with an interest in partnering or licensing content from Academy, please get in touch at [email protected].

What languages will the training be given in?

English is the common language across 47 Degrees. If you have an interest in supporting other languages, please let us know at [email protected].

Is financial aid available for underrepresented or low-income groups?

Our industry is not diverse enough across many measures of representation. Nor is it easily accessible to many minorities or those in low-income scenarios. If you feel that you belong to an underrepresented minority or need help financially, please fill this form. We can apply a course voucher to your registered Academy account. The voucher can be redeemed against any paid course on a one-time basis. The voucher is non-transferable, non-refundable, and has no financial value.

What is the refund policy?

If you request a refund for a paid training course before taking it, we will refund your course fee during our next processing cycle. If you request a refund for a paid training course after starting or accessing it, please email us at [email protected]. Please refer to the full Terms and Conditions before requesting a refund. 47 Degrees reserves the right to refuse refunds.

Are these courses qualified for the FUNDAE (Fundación Tripartita)?

Part of the course cost is reimbursable for companies located in Spain, through Fundae ( formerly, Fundación Tripartita ). If this is your case, please contact us through [email protected] before enrolling in a course.

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