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Ruby | Queue empty? function

  • Last Updated : 07 Jan, 2020
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The empty? is an inbuilt function in Ruby checks if the queue is empty or not?. It returns a boolean value, which is true if the Queue is empty or it returns false.

Syntax: q_name.empty?

Parameters: The function does not takes any element.

Return Value: It returns true if the queue is empty else it returns false.

Example 1:






#Ruby program for empty ? function in Queue
  
#Create a new QUEUE q1
q1 = Queue.new
  
#push 5
     q1.push(5)
  
#push 6
         q1.push(6)
  
#Checks if the queue is empty or not
             puts q1.empty
    ?
  
#Clears the queue
    q1.clear()
  
#Checks if the queue is empty or not
        puts q1.empty
    ?

Output:

false
true

Example 2:




#Ruby program for empty ? function in Queue
  
#Create a new QUEUE q1
q1 = Queue.new
  
#Checks if the queue is empty or not
     puts q1.empty
    ?

Output:

true

Reference: https://devdocs.io/ruby~2.5/queue#method-i-clear

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