javascript - 根据字段划分 JSON 对象数组

Question

这个问题已经有答案了:

reduce array to a by grouping objects with same property (2 个回答)

已关闭 7 年前。

示例 JSON:

"employees":[
    {"firstName":"John", "lastName":"Doe", "address ": "India "}, 
    {"firstName":"Anna", "lastName":"Smith", "address ": "Europe "}, 
    {"firstName":"Peter","lastName":"Jones", "address ": " Canada "},
    {"firstName":"hem", "lastName":"fik", "address ": " Europe "}, 
    {"firstName":"kin", "lastName":"ress", "address ": " India "}, 
    {"firstName":"jack","lastName":"pink", "address ": "Canada "}
] 

我想根据地址字段将上面的 json 数组拆分为多个数组。我的意思是一个 JSON 数组包含地址为“印度”的员工，另一个包含下一个地址，依此类推。

Answer 1

使用Array.prototype.filter()根据条件过滤掉数组元素的函数。

var employees = [{
  "firstName": "John",
  "lastName": "Doe",
  "address ": "India "
}, {
  "firstName": "Anna",
  "lastName": "Smith",
  "address ": "Europe "
}, {
  "firstName": "Peter",
  "lastName": "Jones",
  "address ": " Canada "
}, {
  "firstName": "hem",
  "lastName": "fik",
  "address ": " Europe "
}, {
  "firstName": "kin",
  "lastName": "ress",
  "address ": " India "
}, {
  "firstName": "jack",
  "lastName": "pink",
  "address ": "Canada "
}];
var address = employees.map(function(val) {
  return val['address '].trim();
})
var arrays = {};
for (i in address) {
  arrays[address[i]] = employees.filter(function(val) {
    return val['address '].toLowerCase().indexOf(address[i].toLowerCase()) != -1;
  });
}
console.log(arrays);