Map - A collection type enclosed with [], containing comma-separated key-value pairs.

Define a Map:

Example:

Map map = ["a":1, "b": 2, "c":3]

Map type methods:

• map.keys(): Gets all property names in the dictionary
  Return type: List

Example:

Map map = ["a": 1, "b": 2]

result = map.keys()  // Returns: ["a", "b"]

• map.size(): Returns the number of elements in the dictionary
  Return type: BigDecimal

Example:

Map map = ["a": 1, "b": 2]

result = map.size()  // Returns: 2

• map.isEmpty(): Checks if the dictionary is empty. Returns true if no key-value mappings exist; false otherwise
  Return type: Boolean

Example:

Map map = ["a": 1, "b": 2]

result = map.isEmpty()  // Returns: false

• map.remove(<String key>): Removes and returns the element with the specified key
  Return type: Object

Example:

Map map = ["a": 1, "b": 2]

map.remove("a")  // Returns: 1

• map.clear(): Removes all key-value pairs from the dictionary
  Return type: void

Example:

Map map = ["a": 1, "b": 2]

map.clear()

• map.put(<String key>,<Object value>): Stores a key-value pair
  Return type: void

Example:

Map map = ["a": 1, "b": 2]

map.put('c', 3)

• map.putIfAbsent(<String key>,<Object value>): Stores a key-value pair only if the key doesn't exist
  Return type: Object

Example:

Map map = ["a": 1, "b": 2]

map.putIfAbsent('a', 2)  // The value of key "a" remains 1

• map.containsKey(<String key>): Checks if the dictionary contains the specified key
  Return type: Boolean

Example:

Map map = ["a": 1, "b": 2]

map.containsKey("a");  // Returns: true

• map.containsValue(<Object value>): Checks if the dictionary contains the specified value
  Return type: Boolean

Example:

Map map = ["a": 1, "b": 2]

map.containsValue(2);  // Returns: true

• map.values(): Returns a collection of all values
  Return type: List

Example:

Map map = ["a": 1, "b": 2]

map.values();  // Returns: [1, 2]

• map.each(<Closure closure>): Iterates through dictionary data, passing key and value to the closure
  Return type: List

Example:

Map map = ["a": 1, "b": 2]

map.each {String key,value ->
    log.info(key)
    log.info(value)
}