mentor_oct_25.js

console.log(firstRepeat("legolas"))
console.log(firstRepeat("Gandalf"))
console.log(firstRepeat("Balrog"))
console.log(firstRepeat("Isildur"))
function firstRepeat(str) {
  const seen = {};
  for (let char of str) {
    if(seen[char]) return char
    seen[char] = 1
  }
  return -1
}
uniqueSort([1, 2, 4, 3])// ➞ [1, 2, 3, 4]

uniqueSort([1, 4, 4, 4, 4, 4, 3, 2, 1, 2])// ➞ [1, 2, 3, 4]

uniqueSort([6, 7, 3, 2, 1])// ➞ [1, 2, 3, 6, 7]
function uniqueSort(arr) {
  const seen = {}
  for (let char of arr) {
    seen[char] = 1
  }

  console.log(Object.keys(seen).map(value => Number(value)))
}