Unity Script Reference:
Legacy Documentation: Version 4.3.0
Hashtable
Description

You can use a Hashtable to store key+value pairs.

For detailed information see http://msdn.microsoft.com/en-us/library/system.collections.hashtable.aspx

For C# users: the generic alternative to Hashtable is called Dictionary.
Variables
Count Returns how many elements are in the hashtable.
Functions
Add Adds an element with the specified key and value into the Hashtable.
Clear Count is set to zero, and references to other objects from elements of the collection are also released.
Contains Determines whether the Hashtable contains a specific key.
ContainsKey Determines whether the Hashtable contains a specific key.
ContainsValue Determines whether the Hashtable contains a specific value.
Remove Removes the element with the specified key from the Hashtable.
Messages
Add Adds an element with the specified key and value into the Hashtable.
Clear Count is set to zero, and references to other objects from elements of the collection are also released.
Contains Determines whether the Hashtable contains a specific key.
ContainsKey Determines whether the Hashtable contains a specific key.
ContainsValue Determines whether the Hashtable contains a specific value.
Count Returns how many elements are in the hashtable.
Remove Removes the element with the specified key from the Hashtable.