What is the working of Map in Salesforce?

Hello Shariq,

A map is a collection of key-value pairs where each unique key maps to a single value. Keys and values can be any data type—primitive types, collections, sObjects, user-defined types, and built-in Apex types.

To declare a map, use the Map keyword followed by the data types of the key and the value within <> characters. For example:

Map<String, String> country_currencies = new Map<String, String>();

Map<ID, Set<String>> m = new Map<ID, Set<String>>();

A map is a collection of key-value pairs where each unique key maps to a single value. Keys and values can be any data type—primitive types, collections, sObjects, user-defined types, and built-in Apex types.

Thanks