根据属性过滤对象数组：指南

Question

我有以下房地产家庭对象的 JavaScript 数组：

var json = {
    'homes': [{
            "home_id": "1",
            "price": "925",
            "sqft": "1100",
            "num_of_beds": "2",
            "num_of_baths": "2.0",
        }, {
            "home_id": "2",
            "price": "1425",
            "sqft": "1900",
            "num_of_beds": "4",
            "num_of_baths": "2.5",
        },
        // ... (more homes) ...     
    ]
}

var xmlhttp = eval('(' + json + ')');
homes = xmlhttp.homes;

我想做的是能够对对象执行过滤器以返回“home”对象的子集。

例如，我希望能够基于以下内容进行过滤：price、sqft、num_of_beds 和 num_of_baths。

如何在 JavaScript 中执行类似下面的伪代码的操作：

var newArray = homes.filter(
    price <= 1000 & 
    sqft >= 500 & 
    num_of_beds >=2 & 
    num_of_baths >= 2.5 );

请注意，语法不必与上面完全相同。这只是一个例子。

Answer 1

我很惊讶没有人发布一行回复：

const filteredHomes = json.homes.filter(x => x.price <= 1000 && x.sqft >= 500 && x.num_of_beds >=2 && x.num_of_baths >= 2.5);

...只是为了让您可以更轻松地阅读：

const filteredHomes = json.homes.filter( x => 
  x.price <= 1000 && 
  x.sqft >= 500 && 
  x.num_of_beds >=2 && 
  x.num_of_baths >= 2.5
);

Answer 2

您可以使用数组.prototype.filter方法：

var newArray = homes.filter(function (el) {
  return el.price <= 1000 &&
         el.sqft >= 500 &&
         el.num_of_beds >=2 &&
         el.num_of_baths >= 2.5;
});

实例：

var obj = {
    'homes': [{
            "home_id": "1",
            "price": "925",
            "sqft": "1100",
            "num_of_beds": "2",
            "num_of_baths": "2.0",
        }, {
            "home_id": "2",
            "price": "1425",
            "sqft": "1900",
            "num_of_beds": "4",
            "num_of_baths": "2.5",
        },
        // ... (more homes) ...     
    ]
};
// (Note that because `price` and such are given as strings in your object,
// the below relies on the fact that <= and >= with a string and number
// will coerce the string to a number before comparing.)
var newArray = obj.homes.filter(function (el) {
  return el.price <= 1000 &&
         el.sqft >= 500 &&
         el.num_of_beds >= 2 &&
         el.num_of_baths >= 1.5; // Changed this so a home would match
});
console.log(newArray);