How to use the isempty method of CircularDeque in Julia

Overview

The isempty method is used to check if a CircularDeque object is empty.

Note: CircularDeque is a double-ended queue implementation using a circular buffer of fixed capacity (while creating the deque, the capacity should be provided). It supports insertion and deletion on both ends.

Syntax

isempty(deque_object)

Parameter

This method takes a CircularDeque object as an argument.

Return value

This method returns true if the CircularDeque object contains no elements. Otherwise, it returns false.

Example

using DataStructures
#create a new CircularDeque object for 5 elements 
deque = CircularDeque{Int}(5);
println("Deque ->  $(deque)")
println("Is Deque empty :  $(isempty(deque))")
push!(deque,10);
push!(deque, 20);
push!(deque, 30);
println("\nDeque ->  $(deque)")
println("Is Deque empty :  $(isempty(deque))")

Explanation

  • Line 4: We create a CircularDeque object with the name deque. For this object, we set the capacity as 5, meaning it can hold 5 elements. Also, we set the elements of deque to be an integer datatype.
  • Line 7: We use the isempty method to check if deque is empty. In our case, deque contains no element, so it retuns true.
  • Lines 9–11: We add three integer elements, 10,20,30, to deque using the push! method.
  • Line 14: We use the isempty method to check if deque is empty. In our case, deque contains three elements, so it returns false.

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