Just use SequenceType.flatMap(), remove Array.filterMap() implementation

See http://swiftdoc.org/swift-2/protocol/SequenceType/#func-flatMap

Author: ikesyo

ObjectMapper/Core/Mapper.swift

@@ -200,7 +200,7 @@ public final class Mapper<N: Mappable> {
 	/// Maps an array of JSON dictionary to an array of Mappable objects
 	public func mapArray(JSONArray: [[String : AnyObject]]) -> [N] {
 		// map every element in JSON array to type N
-		return JSONArray.filterMap(map)
+		return JSONArray.flatMap(map)
 	}
 
 	/// Maps a JSON object to a dictionary of Mappable objects if it is a JSON dictionary of dictionaries, or returns nil.
@@ -323,20 +323,6 @@ public final class Mapper<N: Mappable> {
 	}
 }
 
-extension Array {
-	internal func filterMap<U>(@noescape f: Element -> U?) -> [U] {
-		var mapped = [U]()
-
-		for value in self {
-			if let newValue = f(value) {
-				mapped.append(newValue)
-			}
-		}
-
-		return mapped
-	}
-}
-
 extension Dictionary {
 	internal func map<K: Hashable, V>(@noescape f: Element -> (K, V)) -> [K : V] {
 		var mapped = [K : V]()

ObjectMapper/Core/Operators.swift

@@ -203,7 +203,7 @@ public func <- <T: TransformType>(inout left: [String: T.Object]!, right: (Map,
 
 private func fromJSONArrayWithTransform<T: TransformType>(input: AnyObject?, transform: T) -> [T.Object] {
 	if let values = input as? [AnyObject] {
-		return values.filterMap { value in
+		return values.flatMap { value in
 			return transform.transformFromJSON(value)
 		}
 	} else {
@@ -222,7 +222,7 @@ private func fromJSONDictionaryWithTransform<T: TransformType>(input: AnyObject?
 }
 
 private func toJSONArrayWithTransform<T: TransformType>(input: [T.Object]?, transform: T) -> [T.JSON]? {
-	return input?.filterMap { value in
+	return input?.flatMap { value in
 		return transform.transformToJSON(value)
 	}
 }