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Map and filter implemented with a version of reduce taking list as its reduce argument.
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| func reduce<T,R>(list: [T], block: (([R],T) -> R?)) -> [R]? { | |
| var acc = [R]() | |
| for x in list { | |
| if let val = block(acc, x) { | |
| acc += [val] | |
| } | |
| } | |
| return acc | |
| } | |
| func filter<T>(list: [T], filterPass: (T -> Bool)) -> [T]?{ | |
| return reduce(list) { | |
| return filterPass($1) ? $1 : nil | |
| } | |
| } | |
| func map<T,R>(list:[T], mapClosure:(T -> R)) -> [R]? { | |
| return reduce(list) { | |
| return mapClosure($1) | |
| } | |
| } |
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