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[Javascript] Functor law
Functor laws:
1. Identity:
map(id) == id
2. Composition:
compose(map(f), map(g)) == map(compose(f,g))
compose( map(toUpper), map(reverse), toArray )("bingo");compose( map( compose(toUpper reverse), toArray ))("bingo")
Natural Transformations:
"Takes one functor to another without knowing anything about the value".
maybeToArray(Maybe(2)) // [2]maybeToArray(Maybe(null)) // []
compose(nt, map(f)) == compose(map(f), nt)compose(maybeToArray, map(add(1)))(Maybe(5)) //[6]compose(map(add(1)), maybeToArray)(Maybe(5)) // [6]
[Javascript] Functor law
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