Conventionally, Objective C methods which return a value by operating on a parameter adhere to the [ReturnType]with[ParamType] or [ReturnType]by[Operation][ParamType] format. Examples of this in Foundation include NSNumber's numberWithInteger:, NSString's stringByApplyingTransform:reverse:, and NSArray's arrayWithObject:.

fbl_map, fbl_filter, etc. do not follow these conventions. A more idiomatic name for the map method might be fbl_arrayByMappingObjects: or fbl_arrayByMappingObjectsFromArray.

See also: Google Objective-C Style Guide