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Map

Operator Returns
get() Returns the String value to which the specified key is mapped in this identity hash map. Returns null if the map contains no mapping for this key.
size() Returns a number which represents the size of the given map.
isEmpty() Returns a Boolean value - True if this map contains no key-value mappings; 
- False, if this map contains key-value mappings
containKey() Returns a Boolean value - True, if this map contains a mapping for the specified key;
- False, if this map does not contain a mapping for the specified key.
containValue() Returns a Boolean value - True, if this map maps one or more keys to the specified value; otherwise false
keys() Returns a List of the keys contained in this map.
toMap() Returns the Map from given JSON formated String
Map() Returns the Empty Map

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