Codewars Test 1

codewarsOne

function checkIfArray(arr) {
  if (arr.constructor === Array ) {
    return arr;
  } else return convertToArray(arr);
}

function convertToArray(string) {
  return Array.from(string);
}

function verifyLength(data) {
  if (data.length === 0) {
    return 0;
  } else if (data.length === 1) {
    return 1
  } return data.length;
}

function verifyDups(array) {
  // we need to return items in an array only if they do not match the ref point that was just verified
  return array.filter((ref, i) => {
    if (ref === array[i+1]) {
      return null;
    } else {
      return ref;
    }
  });
}

function uniqueInOrder(iterable){
  // should work with empty arrays
  // should work with one element
  // should work with larger arrays
  let length = verifyLength(iterable);
  if (length === 0) {
    return [];
  } else if (length === 1) {
    return checkIfArray(iterable);
  } else {
    return verifyDups(checkIfArray(iterable));
  }
}

console.log(uniqueInOrder('AAAABBBCCDAABBB'));
console.log(uniqueInOrder('a'));
console.log(uniqueInOrder(''));