Two level of compositions, one at function level, one at type level.
(x: T)-- local variable.- if a function return function, will the returned function be applied?
[ dup mul ] (square)[ { x: 1, y: 2 } (obj) obj.x obj.y add ] (three)[ (f) [ (x) x x f ] [ (x) x x f ] ] (Y)
@ty List [ Type - Type ]
@fn List [ (A) @datatype {
null [ A List ]
cons [ A - A List - A List ]
}
]
@ty List.append [ A List - A List - A List ]
@fn List.append [ (y) @match {
List.null [ y ]
List.case [ (head) (tail) y tail List.append head List.cons ]
}
]
@ty List.map [ [ A - B ] - A List - B List ]
@fn List.map [ (f) (x) x @match {
List.null [ x ]
List.cons [ (head) [f] List.map head f List.cons ]
}
]
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