merge extension

let odds = [ "a": 1, "c": 3, "e": 5 ]
let evens = [ "b": 2, "d": 4, "f": 6 ]

extension Dictionary {

    func mergeWith(other: [Key: Value]) -> [Key: Value] {
        var result = self
        for (k, v) in other {
            result[k] = v
        }
        return result
    }

}

let result = odds.mergeWith(evens)

merge swiftly

let odds = [ "a": 1, "c": 3, "e": 5 ]
let evens = [ "b": 2, "d": 4, "f": 6 ]
// likely performs horribly!
let result = odds.reduce(evens) { (var d, p) in d[p.0] = p.1; return d }
result