Dictionary as a new Collection type

[Colho]

Dictionary as a new Collection type would be beneficial, as dictionary is a widely used data structure. Basic idea is to have <Key, Value> pair, where a key is always associated with a value.

Dictionary characteristics:

• Key and value pairs can be added to the dictionary
• Key and value pairs can be removed from the dictionary
• Values can be fetched from the dictionary with a key
• Every key in dictionary must be unique
• Keys can be tested are they already in the dictionary

Some remarks:

• Using hash table for fast value lookup?
• Possibility to enumerate all the key and value pairs? (for looping through the dict?)
• Equality comparer for generic objects?