CODEWITHSUNDEEP
javascript
totothegreat
totothegreat

Reputation: 1643

The quickest way to find if object has a certain property and truth?

I want to do the simple yet need the fastest way of doing so in javascript:

I have this array :

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

I have 2 things i want to do in the best, fastest way possible:

1)If i have in the array a true in the "inInjured" Property, to anyone.

2) i want to extract the 3 lowest stamina players, and extract the key of one of those.

I want to avoid, if possible, from doing 2 forEach for this, so what is the best way?

Upvotes: 0

Views: 56

Answers (2)

Bazinga
Bazinga

Reputation: 11234

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>

Upvotes: 2

Mritunjay
Mritunjay

Reputation: 25892

Use Array native some function like bellow

var isSomeoneInjurd = players.some(function(pl){
    return pl.isInjured;
});

The value of isSomeoneInjurd will be true if any of player has property isInjured as true. And it will break the loop as soon as it gets one true for that property.

Upvotes: 1

Related Questions