function keys(object) {
  return Object.keys(object);
}

let queue = {
  attackQueue: [],

  add: function(object) {
    let propName = keys(object), array = [], outerArr = [];

    for (let i = 0; i < propName.length; i++) {
      if (propName[i] === "name") {
        outerArr.push(object[propName[i]]);
      } else if (propName[i] === "command" || propName[i] === "hitChance") {
        array.push([propName[i], object[propName[i]]]);
      }
    }
    outerArr.push(array);
    queue.attackQueue.push(outerArr);
  },

  remove: function(object) {

    for (let i = 0; i < queue.attackQueue.length; i++) {
      if (object.name === queue.attackQueue[i][0]) {
        queue.attackQueue.splice([i], 1);
      }
    }
  },

  sort: function() {
    queue.attackQueue.sort(function(a, b) {
      if (a[1][0][1] < b[1][0][1]) {
        return 1;
      }
    })
  },

  removeFirst: function() {
    queue.attackQueue.shift();
  },

  reset: function() {
    queue.attackQueue = [];
  }
}

function executeRound() {
  let length = queue.attackQueue.length, arr = queue.attackQueue;

  while (queue.attackQueue.length !== 0) {
    window[arr[0][1][1][1].toLowerCase()]();  // I used toLowerCase just in case the commands would have been wrote in upperCase
    console.log("removed entity " + arr[0][0] + " !");
    queue.removeFirst();
  }
}

function attack() {
  console.log("attack");
}

function defend() {
  console.log("defend");
}

// example
let player1 = {
  name: "player1",
  hitChance: 9000,
  command: "attack"
}

// add player1 to the queue
queue.add(player1);

// execute function "executeRound"
executeRound();

console.log(queue.attackQueue) // --> "removed entitiy player1 !"