How do I find the key-value of a map in Salesforce?

How to use Map methods in Salesforce

Map is one of the most common data structures in Java, and String is one of the most common types for a map’s key. By default, a map of this sort has case-sensitive keys .26 May 2020

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. Map keys and values can contain any collection, and can contain nested collections.

Yes. Collection membership is case sensitive . This applies to Sets: If the set contains String elements, the elements are case-sensitive.