Rotation of Circular Linked List without Tail

circular-linked-list.js

const createNode = (value) => ({
  value,
  next: null,
})
class CircularLinkedList {
  constructor() {
    this.length = 0
    this.head = null
  }
  push(value) {
    const node = createNode(value)
    if (!this.head) {
      this.head = node
    } else {
      let length = this.length
      let current = this.head
      while (length > 1) {
        current = current.next
        length--
      }
      current.next = node
    }
    node.next = this.head
    this.length++
    return node
  }
  append(value) {
    const node = createNode(value)
    node.next = this.head
    this.head = node
    this.length++
  }
  print() {
    const values = []
    let current = this.head
    let length = this.length
    while (length > 0) {
      values.push(current.value)
      current = current.next
      length--
    }
    return values.join(' => ')
  }
  // counter clockwise
  rotate(n) {
    let i = 0
    while (i < n) {
      let length = 1
      while (length < this.length) {
         this.head = this.head.next
         length++
      }
      i++
    }
  }
}
const list = new CircularLinkedList()
list.push('a')
list.push('b')
list.push('c')
list.push('d')
console.log(list.print())
list.rotate(3)
console.log(list.print())