Ruby program to get keys from a hash collection

Program/Source Code:

The source code to get keys from a hash collection is given below. The given program is compiled and executed on Windows 10 Operating System successfully.

# Ruby program to get keys 
# from a hash collection

students = {"101" => "Amit", "102" => "Arun", "103" => "Sumit"};

puts "Student ids: ",students.keys();

Output:

Student ids: 
101
102
103

Explanation:

In the above program, we created a hash collection to store student information. Here we stored student id, student name using key/value pair in the hash collection. After that, we got keys from the hash collection using the keys() method and printed them.