Maps are like hash map or associative array (in other languages).

flag package allows us to parse arguments and flags program generates a random number from given min and max we can run our program with arguments fex.

html/template package supports HTML templates automatically escapes data which means there is no need to worry about about XSS attacks To access the data in a template the top most variable is access by {{.}}.

get keys and list k/v pairs.

Closures can simulate Object Oriented Programming / Encapsulation https://play.golang.org/p/h8CFauMTzrW */.