JavaScript. Linked Lists. Circular List.

JavaScript. Linked Lists. Circular List.

Today, we are going to break into small parts a new chapter which calls Circular List. What is that? So basically we have a linked list and the node of this list is pointing to the element which we pass. In the result, we receive an infinity loop which break our code. We have to make sure that our list avoid being infinity loop. Let’s create a method which will help us to check if it’s true or false.

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Hello everyone who is reading this blog. I am happy to move forward with Linked Lists and discuss more problems and find more solutions to this problems. Today, we are going to break into small parts a new chapter which calls Circular List. What is that? So basically we have a linked list and the node of this list is pointing to the element which we pass. In the result, we receive an infinity loop which break our code. We have to make sure that our list avoid being infinity loop. Let’s create a method which will help us to check if it’s true or false.

If you just started with the linked lists, I highly recommend to look through some blogs:

JavaScript.Linked Lists. What is “Linked Lists”? Create a Node Class API

Hello for new readers and welcome back who is still with me. Just want to mention that I stopped writing blogs about…

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Check if list is circular

Directions

Given a linked list, return true if the list is circular, false if it is not.

Example

const l = new LinkedList();
const a = new Node('a')
const b = new Node('b')
const c = new Node('c')
l.head = a 
a.next = b
b.next = c
c.next = b
circular(l)

Let’s start with the list of 5 nodes. As you can see we have circular list where purple close list on ‘red’ element. The idea of this algorithm is to create two variables “slow” and “fast”. Where “slow” will have one step, “fast” two steps. When slow and fast will have the same node it will return true. Otherwise, it will return false.

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