closestEnemy.js

const closestEnemy = (arr) => {
  let player = [];
  let enemy = [];
  let distance = 0;
  let rowLength = arr[0].length;
  let board = arr.length;

  for (let i = 0; i < board; i++) {

    let row = arr[i].split("");
    let rowLength = row.length;

    for (let j = 0; j < rowLength; j++) {
      if (row[j] == 1) {
        player.push(j, i);
      } else if (row[j] == 2) {
        enemy.push(j, i);
      }
    }
  }

  let enemyLength = enemy.length;

  for (let i = 0; i < enemyLength; i += 2) {
    
    let newDistance = 0;
    
    if (Math.abs(player[0] - enemy[i]) < rowLength / 2) {
      newDistance = Math.abs(player[0] - enemy[i]);
    } else {
      newDistance = rowLength - Math.abs(player[0] - enemy[i]);
    }

    if (Math.abs(player[1] - enemy[i+1]) < board / 2) {
      newDistance += Math.abs(player[1] - enemy[i+1]);
    } else {
      newDistance += board - Math.abs(player[0] - enemy[i]);
    }

    if (distance == 0 || newDistance < distance) {
      distance = newDistance;
    }
  }
  return distance;
}

closestEnemy(["0000", "2010", "0000", "2002"]);
closestEnemy(["0000", "1000", "0002", "0002"]);
closestEnemy(["0000", "2010", "0000", "2002"]);