javascript - 找出对象是否具有某种属性和真实性的最快方法？

Question

我想做简单的事情，但需要在 javascript 中以最快的方式做到这一点:

我有这个数组:

   players: [{
       isInjured : false,
       name: ... 
       stamina : 50
   },{
       isInjured : true,
       name: ...,
       stamina : 20
   }
   ...
]

我有两件事想要以最好、最快的方式做:

1)如果我在数组中的“inInjured”属性中为 true，则对任何人都有效。

2)我想提取3个体力最低的玩家，并提取其中之一的 key 。

如果可能的话，我想避免为此执行 2 个 forEach，那么最好的方法是什么？

Answer 1

var players = [{
  isInjured: false,
  stamina: 50
}, {
  isInjured: false,
  stamina: 10
}, {
  isInjured: false,
  stamina: 15
}, {
  isInjured: false,
  stamina: 16
}, {
  isInjured: true,
  stamina: 20
}];



// Your second request you can do with lodash or underscore easily

var threePlayersWithMinStamina = _.take(_.sortBy(players, function(player) {
  return player.stamina;
}), 3);

console.log(threePlayersWithMinStamina) // you have the three players with the min stamina

//Your first request
// the var isOneInjured will be true if the condition will be true and stop the loop
var isOneInjured = players.some(function(player) {
  return player.isInjured;
});

<script src="https://cdn.rawgit.com/lodash/lodash/3.0.1/lodash.min.js"></script>