drawing book hackerrank

drawing_book.js

/*
https://www.hackerrank.com/challenges/drawing-book/problem?isFullScreen=true
Given and , find and print the minimum number of pages that must be turned in order to arrive at page . 
*/

function pageCount(n, p) {
  let index = 0;
  const chunks = [];
  const arr = [...Array(n + 1).keys()];
  for (let i = 0; i < arr.length; i += 2) {
    const slice = arr.slice(i, i + 2);
    if (slice.includes(p)) index = chunks.length;
    chunks.push(slice);
  }
  return Math.min(index, chunks.length-1-index);
}