更新数组中的过滤对象

Question

我有一个对象数组。 我想过滤它们，然后对过滤后的对象进行处理。 到目前为止，这是我的尝试。

职位对象

    function Position (title, type, purchasable){
    this.title = title;
    this.type = type;
    this.purchasable = purchasable || false;
}
function Purchasable (prices){
    this.owner = "unowned";
    this.rating = 0;
    this.prices = prices;
    this.price = this.prices[this.rating];
}
function City (title,set,prices){
    Position.call(this, title, "city", true);
    Purchasable.call(this, prices);
    this.set = set;
}
positions = [
    new City("Cairo", "brown", [60,2,10,30,90,160,250]),
    new City("Vienna", "brown", [60,4,20,60,180,320,450]),
    new City("Vienna", "blue", [60,4,20,60,180,320,450])
    ];
});

功能

function test() {
    var set = "brown";
    positions.filter(function(obj){
        obj.set === "brown"; //do something to every brown set, eg owner = me
    });
    //I want to change the values of the objs in positions array


}

Answer 1

您需要过滤器回调来返回true / false。 当当前项目应包含在结果数组中时，您想返回true，如果应将其排除在外，则返回false。 因此，如果要过滤obj.set ===“ brown”的位置，请执行以下操作：

var filtered = positions.filter(function(obj){
    if (obj.set === "brown") {
        obj.owner = "me";  // your additional action to perform
        return true;
    }
    return false;
});

正如“只是某人”在评论中指出的那样，通常使过滤器执行除过滤部分以外的任何操作都是不明智的做法。 但是上面的示例向您展示了如何根据原始问题在过滤器内执行此操作。

Answer 2

var set = "brown"
var filtered = positions
  .filter(function (obj)
  {
    return obj.set === "brown"
  })
  .map(function (obj)
  {
    obj.owner = me
    return obj
  })
;
console.log(filtered);

Answer 3

jQuery .each()函数呢？ https://api.jquery.com/each/

function test() {
    var set = "brown";
    var filtered = positions.filter(function(obj){
        obj.set === "brown"; //do something to every brown set, eg owner = me
    }).each(function(index, item){
         //do something with the object here; your objects are the item parameter

         obj.owner = "me";
    });

}