Modeling Your View Models as Functions
At Grailed we’ve turned to functional programming for inspiration on how to write testable, well-structured view models.
Nested Mapping
“Free map functions express the nesting nicely: map: ((A) -> B) -> (Signal) -> Signal map: ((A) -> B) -> ([A]) -> [B] Then the nested map is function composition: (map < map): ((A) -> B) -> (Signal