javascript - jQuery:打印数组中一组重复对象中的第一个对象

Question

我有一个像这样的数组:

var json.result= [
{"id":"0","category":"Camera","name":"600D Kit", "condition":"OK"},    
{"id":"1","category":"Camera","name":"600D Kit", "condition":"missing cap"},        
{"id":"2","category":"Camera","name":"7D Kit", "condition":"OK"},
{"id":"3","category":"Camera","name":"7D Kit", "condition":"OK"}]

我正在尝试执行以下操作:1/找到所有“名字”2/当发现重复的“name”时，只打印第一个对象

因此结果将是:
设备id:0
类别:相机
名称:600D套件

设备 ID:2
类别:相机
名称:7D套件

以下是我的尝试:

json.result.map(function(equipment){

    var equipmentNamesArray = equipment.name;
    var arr = $.makeArray(equipmentNamesArray);

    var uniqueNames = equipmentNamesArray.reduce(function(a,b){
        if (a.indexOf(b) < 0) a.push(b);    
    }, equipmentNamesArray);
    console.log("equipment ID: ", uniqueNames.id);
    console.log("category: ", uniqueNames.category);
    console.log("name: ", uniqueNames);     
});

但是，我遇到了 TypeError: EquipmentNamesArray.reduce is not a function 错误。如果有人能告诉我哪一部分逻辑做错了，我将不胜感激:)))

干杯，凯伦

Answer 1

这是您需要的代码:

JSFiddle

var json = [], equipmentNamesArray = [];

json.result= [
{"id":"0","category":"Camera","name":"600D Kit", "condition":"OK"},    
{"id":"1","category":"Camera","name":"600D Kit", "condition":"missing cap"},        
{"id":"2","category":"Camera","name":"7D Kit", "condition":"OK"},
{"id":"3","category":"Camera","name":"7D Kit", "condition":"OK"}];

json.result.map(function(equipment) {
    if ($.inArray(equipment.name, equipmentNamesArray) === -1) {
      console.log(equipment);
      equipmentNamesArray.push(equipment.name);
    }
});

您必须创建 equipmentNamesArray 数组来包含在其他所有内容之前检查的项目，当您开始迭代主 result 数组时，您将检查 equipment. name 已在 equipmentNamesArray 数组中。

如果它不在数组中，则打印它并将其推送到数组中。

那么下一个将被跳过，因为它还包含在 equipmentNamesArray 数组中。

这是另一个版本，进行了更改以保留仅包含您想要的项目的新数组:JSFiddle 2