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September 8, 2021 17:18
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Functions are Functors
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| import cats.syntax.functor._ | |
| // Some types | |
| trait A | |
| trait B | |
| trait C | |
| // Some functions | |
| val f: A => B = ??? | |
| val g: B => C = ??? | |
| // Function composition | |
| val h1: A => C = g compose f // or... | |
| val h2: A => C = f andThen g | |
| // Functions are Functors where `map` is function composition! | |
| val h3: A => C = f map g |
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