javascript - 在具有一个条件的数组中搜索值

Question

我有一组玩家

所以我想创建一个函数来根据条件相互匹配

我开始思考（让队列中的第一个玩家）并尝试找到另一个符合条件的玩家

但后来我想：如果我不匹配第一个玩家，我永远不会移动到第二个匹配

基本上我需要从队列中获得 2 个满足条件的玩家，无论他们在队列中的位置如何

  searching(id) {
    const firstPLayer = this.players.find(p => p.id == id)
    const { mmr } = firstPLayer
    const secondPlayer = this.players.find((playerTwo) => playerTwo.mmr < (5 / 100) * mmr + mmr && playerTwo.mmr > mmr - ((5 / 100) * mmr) && playerTwo.id != firstPLayer.id);
    if(!secondPlayer){
      return null;
    }
    const matchedPlayers = [
      firstPLayer,
      secondPlayer
    ]
    // remove matched players from this.players
    this.removePlayers(matchedPlayers);
    // return new Match with matched players
    return matchedPlayers;
  }

像这样，我有两个条件|：

playerTwo.mmr <(5/100) * mmr + mmr && playerTwo.mmr> mmr - ((5/100) * mmr)

但是如果我需要在不通过第一个玩家的情况下获取两个具有这种条件的玩家

标签： javascriptnode.js

Answer 1

很难说为什么它不适合您（您确定在您的玩家列表中甚至有 2 个玩家与您的参数匹配吗？）..

您可以使用以下示例来帮助您，因为它似乎对我有用。

class Queue {
  constructor() {
    this.players = fetchPlayers();
  }
  
  removePlayers(playersToRemove) {
    playersToRemove.forEach(player => {
      const index = this.players.indexOf(player);
      this.players.splice(index, 1);
    })
  }
  
  getRandomPlayer() {
    return this.players[Math.floor(Math.random() * this.players.length)];
  }
  
  calculateLessThanPercentage(player) {
    return 5 / 100 * player.mmr + player.mmr 
  }
    
  calculateGreaterThanPercentage(player) {
    return player.mmr - 5 / 100 * player.mmr
  }

  searching() {
    const firstPlayer = this.getRandomPlayer();
    
    const secondPlayer = this.players.find(
      playerTwo =>
        playerTwo.mmr < this.calculateLessThanPercentage(firstPlayer) &&
        playerTwo.mmr > this.calculateGreaterThanPercentage(firstPlayer) &&
        playerTwo.id != firstPlayer.id
    );
    
    if (!secondPlayer) {
      return null;
    }
    
    const matchedPlayers = [firstPlayer, secondPlayer];
    this.removePlayers(matchedPlayers);
    return matchedPlayers;
  }
}

const ActiveQueue = new Queue();

const getPlayersButton = document.getElementById("getPlayers");
const playersResults = document.getElementById("players");
const allPlayers = document.getElementById("allPlayers");

getPlayersButton.addEventListener("click", () => {
  getPlayers(ActiveQueue, playersResults, allPlayers)
});

// getPlayersButton click event handler
function getPlayers(queue, resultsElement, allPlayersElement) {
  const searchResults = queue.searching();
  resultsElement.innerHTML = JSON.stringify(searchResults, null, 2);
  allPlayersElement.innerHTML = "Remaining Players: " + JSON.stringify(queue.players, null, 2);
}

// to get data
function fetchPlayers() {
  return [
    {
      name: "Player One",
      id: 1,
      mmr: 500
    },
    {
      name: "Player Two",
      id: 2,
      mmr: 800
    },
    {
      name: "Player Three",
      id: 3,
      mmr: 810
    },
    {
      name: "Player Four",
      id: 4,
      mmr: 815
    },
    {
      name: "Player Five",
      id: 5,
      mmr: 510
    },
    {
      name: "Player Six",
      id: 6,
      mmr: 540
    },
    {
      name: "Player Seven",
      id: 7,
      mmr: 530
    },
    {
      name: "Player Eight",
      id: 8,
      mmr: 520
    }
  ];
}

button {
  margin-top: 10px;
}

Click to get players (scroll all the way down to see remaining players)
<br />
<button id="getPlayers">Get Players</button>
<pre id="players"></pre>
<br />
<hr />
<pre id="allPlayers"></pre>