Loops in Ruby

Iterative statements are termed as loops; as with any other programming language, loops also exist in Ruby programming. Let's use them and see how their syntax differs from other languages:

def forl(a) 
for i in 0..a 
print("Number #{i}n") 
end 
end 
forl(10) 

The preceding code iterates the loop from 0 to 10, as defined in the range, and consequently prints out the values. Here, we have used #{i} to print the value of the i variable in the print statement. The n keyword specifies a new line. Therefore, every time a variable is printed, it will occupy a new line.

Iterating loops through each loop is also a common practice and is widely used in Metasploit modules. Let's see an example:

def each_example(a) 
a.each do |i| 
print i.to_s + "t" 
end 
end 
# Main Starts Here 
a = Array.new(5) 
a=[10,20,30,40,50] 
each_example(a) 

In the preceding code, we defined a method that accepts an array, a, and prints all its elements using the each loop. Performing a loop using the each method will store elements of the a array into i temporarily, until overwritten in the next loop. t, in the print statement, denotes a tab.

Refer to http://www.tutorialspoint.com/ruby/ruby_loops.htm for more on loops.