IsAnagramWith.swift

// Checks if a string is anagram with another

extension String {
    func isAnagramWith(s: String) -> Bool {
        var dict = [Character:Int]()
        for char in self{
            dict[char] = 1 + (dict[char] ?? 0)
        }
        for char in s {
            if dict[char] != nil {
                let val = dict[char]! - 1
                dict[char] = val == 0 ? nil : val
            }else{
                return false
            }
        }
        return dict.count == 0
    }
}