pickingNumbers.js

function pickingNumbers(a) {
  // Write your code here
  let sortedArray = a.sort(function (a, b) {
    return a - b;
  });

  let currentArray = [];
  let longestArray = 0;
  let startNumber = 0;
  for (let i = 0; i < sortedArray.length; i++) {
    let result = Math.abs(sortedArray[startNumber] - sortedArray[i]);
    if (result <= 1) {
      currentArray.push(sortedArray[i]);
      if (currentArray.length > longestArray) {
        longestArray = currentArray.length;
      }
    } else {
      startNumber = i;
      if (currentArray.length > longestArray) {
        longestArray = currentArray.length;
      }
      currentArray = [];
      currentArray.push(sortedArray[i]);
    }
  }
  return longestArray;
}

pickingNumbers([1, 2, 2, 3, 1, 2]);