Collection - Map (Associative arrays|Dictionary)

A map is an object that maps keys to values (known as property)

Also known as:

• associative memories” or “associative arrays”
• dictionary
• hash table

A map cannot contain duplicate keys; each key can map to at most one value.

A map holds a set of key/ value pairs and provides constant-time operations to store, retrieve, or test for an item in the set.

In javascript, an object can be seen as a map of properties.

• hashmap.
• LinkedHashMap
• TreeMap