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| 1. pattern matching and functional composition
https://twitter.github.io/scala_school/pattern-matching-and-functional-composition.html
scala compose partial functions
scala> val fComposeG = f _ compose g _
fComposeG: (String) => java.lang.String = <function>
scala> fComposeG("yay")
res0: java.lang.String = f(g(yay))
andThen
andThen is like compose, but calls the first function and then the second, g(f(x))
scala> val fAndThenG = f _ andThen g _
fAndThenG: (String) => java.lang.String = <function>
scala> fAndThenG("yay")
res1: java.lang.String = g(f(yay))
2. map
3. implicit parameters
4. [T] T+ T- usage?
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