Dictionary+Merging.swift

extension Dictionary {
    func merged(another: [Key: Value]) -> Dictionary {
        var result: [Key: Value] = [:]
        for (key, value) in self {
            result[key] = value
        }
        for (key, value) in another {
            result[key] = value
        }
        return result
    }
}

extension Dictionary where Value: RangeReplaceableCollectionType {
    func merged(another: [Key: Value]) -> [Key: Value] {
        var result: [Key: Value] = [:]
        for (key, value) in self {
            result[key] = value
        }
        for (key, value) in another {
            if let collection = result[key] {
                result[key] = collection + value
            } else {
                result[key] = value
            }
            
        }
        return result
    }
}

let parameter1 = ["id": "1"]
let parameter2 = ["name": "naoty"]
parameter1.merged(parameter2)   //=> ["id": "1", "name": "naoty"]

let sort1 = ["sort": ["id"]]
let sort2 = ["sort": ["name"]]
sort1.merged(sort2) //=> ["sort": ["id", "name"]]