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What is Map Class in Apex Salesforce?

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Map Class in Apex:

Map Class Contains methods for the Map collection type.

A Map is a collection of key values pairs where each unique key map to a single value.

Map keys and values can be any data type primitive types, collections, sObjects, users defined types, and built-in Apex Types.

For Example, the following table represents a map of countries and currencies

Country(Key) ‘United States’ ‘Japan’ France’ ‘England’ ‘India’

Currency (Value) ‘Dollar’ Yen’ ‘Euro’ ‘Pound’ ‘Rupee’

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