circular array javascript es6 hackerrank question #spoiler

CircularArray.js

#!/usr/bin/env node
"use strict"

class CircularArray {
  constructor(n, k, q, arr, debug = false) {
    this.n = n      // number of integers
    this.k = k      // rotations
    this.q = q      // queries
    this.arr = arr
    this.debug = debug
    this.rotate()
  }

  query(m) {
    return this.arr[m]
  }

  rotate() {
    let moves
    if (this.k == this.n) return
    if (this.k > this.n) {
      moves = Math.abs(parseInt((this.k % this.n) - this.n))
    } else {
      moves = Math.abs(parseInt(this.n - this.k))
    }

    if (this.debug) console.log("moves: ", moves)
    let endArr = this.arr.splice(moves, this.k)
    if (this.debug) console.log("endArr: ", endArr)
    this.arr.unshift(...endArr)
    if (this.debug) console.log("this.arr: ", this.arr)
  }
}

var n = 3, k = 2, q = 3
var arr = [1, 2, 3]
var ca = new CircularArray(n, k, q, arr, true)
console.log(ca.query(0) == 2)
console.log(ca.query(1) == 3)
console.log(ca.query(2) == 1)
console.log(ca.arr)

var n = 6, k = 2, q = 3
var arr = [1, 2, 3, 4, 5, 6]
var ca = new CircularArray(n, k, q, arr, true)
console.log(ca.query(0) == 5)
console.log(ca.query(1) == 6)
console.log(ca.query(2) == 1)
console.log(ca.arr)

var n = 6, k = 7, q = 3
var arr = [1, 2, 3, 4, 5, 6]
var ca = new CircularArray(n, k, q, arr, true)
console.log(ca.query(0) == 6)
console.log(ca.query(1) == 1)
console.log(ca.query(2) == 2)
console.log(ca.arr)