从数组中获取唯一对象的更好方法

Question

I have an array with objects. Each object got an unique id. What is the best way to get a specific object from the array?

Currently I use something like this

  this.getObjectById = function(objectId){
    return $.grep(this.objects, function(e){ return e.id === objectId; })[0];
  }

but the fact that

$.grep();

returns an array of results I don't know if I should go for this. Because currently I take the first element of this array and it's fine because I just got one element in it.

But is there a more clean way?

Is

Array.prototype.find()

a better one?

Answer 1

Find is faster since it returns the first match, while jquery grep loops trough entire array. If you need full browser support just create you own function:

this.getObjectById = function(objectId){
  for(var i = 0; i<this.objects.length; i++){
    if(objectId == this.objects[i].id) return this.objects[i];
  }
  return null;
}

Answer 2

使用underscore.js _.find（）方法来迭代您的集合。