Invariant Functors Unlocked

Covariant Functor

Contravariant Functor

Example for Contravariant Functor

Usage

Example for covariant Functor

Note

When is invariant functor?

EncodeJson and DecodeJson

Functor but invariant

Apply, Applicative to Divide, Divisible

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A software engineer and a functional programming enthusiast at Simple-machines, Sydney, and a hardcore hiking fan. https://twitter.com/afsalt2

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