Swift - get from dictionary, with default value

Dictionary_get.swift

extension Dictionary {

    func get(key: Key, defaultValue: Value) -> Value {
        /**
          Returns the value for the given key (if exists), otherwise returns the default value.
        */
        if let value = self[key] {
            return value
        } else {
            return defaultValue
        }
    }
}

It seems dict[key, default: value] is what you need.

Here is the API reference.