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Groovy - Maps
A Map (also known as an associative array, dictionary, table, and hash) is an unordered collection of object references. The elements in a Map collection are accessed by a key value. The keys used in a Map can be of any class. When we insert into a Map collection, two values are required: the key and the value.
Following are some examples of maps −
[‘TopicName’ : ‘Lists’, ‘Author’ : ‘Raghav’] – Collections of key value pairs which has TopicName as the key and their respective values.
[ : ] – An Empty map.
In this chapter, we will discuss the map methods available in Groovy.
| Sr.No. | Methods & Description |
|---|---|
| 1 | containsKey()
Does this Map contain this key? |
| 2 | get()
Look up the key in this Map and return the corresponding value. If there is no entry in this Map for the key, then return null. |
| 3 | keySet()
Obtain a Set of the keys in this Map. |
| 4 | put()
Associates the specified value with the specified key in this Map. If this Map previously contained a mapping for this key, the old value is replaced by the specified value. |
| 5 | size()
Returns the number of key-value mappings in this Map. |
| 6 | values()
Returns a collection view of the values contained in this Map. |