The pop() is an inbuilt function in Ruby returns the element in the front of the queue and removes it from the queue.
Syntax: q_name.pop()
Parameters: The function does not takes any element.
Return Value: It returns the first element which is at the front of the queue and removes it from the queue.
Example 1:
#Ruby program for pop() function in Queue #Create a new QUEUE q1 q1 = Queue.new
#push 5 q1.push(5)
#push 6 q1.push(6)
#Prints the top - most element and also pops it puts q1.pop
puts q1.pop
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Output:
5 6
Example 2:
#Ruby program for pop function in Queue #Create a new QUEUE q1 q1 = Queue.new
#push 12 q1.push(12)
#push 21 q1.push(21)
#Prints the top - most element and also pops it puts q1.pop
puts q1.pop
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Output:
12 21
Reference: https://devdocs.io/ruby~2.5/queue#method-i-pop