First Recurring character using Array & Hash Table

//Google Question
//Given an array = [2,5,1,2,3,5,1,2,4]:
//It should return 2

//Given an array = [2,1,1,2,3,5,1,2,4]:
//It should return 1

//Given an array = [2,3,4,5]:
//It should return undefined


function firstRecurringCharacter(input) {
  for (let i = 0; i < input.length; i++) {
    for (let j = i + 1; j < input.length; j++) {
      if(input[i] === input[j]) {
        console.log(input[i]);
      }
    }
  }
  return undefined
}

function firstRecurringCharacter2(input) {
  let map = {};
  for (let i = 0; i < input.length; i++) {
      
    if (map[input[i]] !== undefined) {
      console.log(input[i]);
    } else {
      map[input[i]] = i;
    }
  }
  console.log(map)
  return undefined
}

firstRecurringCharacter2([2,5,1,2,3,5,1,2,4])