===== NSDictionary =====
The NSDictionary class declares the programmatic interface to objects that manage immutable associations of keys and values. A key-value pair within a dictionary is called an entry.\\
Use this class when you need a convenient and efficient way to retrieve data associated with an arbitrary key.\\

[[objective-c:foundation.framework:nsdictionary.h:init|init]]\\
[[objective-c:foundation.framework:nsdictionary.h:initWithObjectsAndKeys|initWithObjectsAndKeys]]\\
[[objective-c:foundation.framework:nsdictionary.h:count|count]]\\
[[objective-c:foundation.framework:nsdictionary.h:allKeys|allKeys]]