Question

请在下面找到我的JSON：我想识别唯一用户并获得相应的唯一用户值计数。例如：

userID： user1 有3条记录，我想形成如下的JSON：

预期结果JSON：

[ {
  "userId" : "user1",
  "success" : 1,
  "error" : 0,
  "cancel" : 0,
  "visit" : 3,
  "enroll" : 2,
  "uninstall" : 0
}]

user1有1 成功，2 ENROLLED 和3 ** VISITED **，其余值 null 所以我们必须算作 0

我们必须为剩下的用户做同样的事情。

你能否帮助我使用javascript / jquery来实现这一目标。

主要JSON：

[ {
  "userId" : "user1",
  "success" : null,
  "error" : null,
  "cancel" : null,
  "visit" : "VISITED",
  "enroll" : "ENROLLED",
  "uninstall" : null
}, {
  "userId" : "user1",
  "success" : null,
  "error" : null,
  "cancel" : null,
  "visit" : "VISITED",
  "enroll" : "ENROLLED",
  "uninstall" : null
}, {
  "userId" : "user1",
  "success" : "SUCCESS",
  "error" : null,
  "cancel" : null,
  "visit" : "VISITED",
  "enroll" : null,
  "uninstall" : null
}, {
  "userId" : "user2",
  "success" : "SUCCESS",
  "error" : null,
  "cancel" : null,
  "visit" : "VISITED",
  "enroll" : null,
  "uninstall" : null
}, {
  "userId" : "user2",
  "success" : null,
  "error" : null,
  "cancel" : null,
  "visit" : "VISITED",
  "enroll" : "ENROLLED",
  "uninstall" : null
}, {
  "userId" : "user2",
  "success" : null,
  "error" : null,
  "cancel" : null,
  "visit" : "VISITED",
  "enroll" : "ENROLLED",
  "uninstall" : null
}, {
  "userId" : "user2",
  "success" : "SUCCESS",
  "error" : null,
  "cancel" : null,
  "visit" : "VISITED",
  "enroll" : null,
  "uninstall" : null
}, {
  "userId" : "user3",
  "success" : "SUCCESS",
  "error" : null,
  "cancel" : null,
  "visit" : "VISITED",
  "enroll" : null,
  "uninstall" : null
}, {
  "userId" : "user3",
  "success" : null,
  "error" : null,
  "cancel" : null,
  "visit" : "VISITED",
  "enroll" : "ENROLLED",
  "uninstall" : null
}, {
  "userId" : "user4",
  "success" : null,
  "error" : null,
  "cancel" : null,
  "visit" : "VISITED",
  "enroll" : "ENROLLED",
  "uninstall" : null
}, {
  "userId" : "user4",
  "success" : null,
  "error" : null,
  "cancel" : "CANCELLED",
  "visit" : "VISITED",
  "enroll" : null,
  "uninstall" : null
}, {
  "userId" : "user4",
  "success" : null,
  "error" : null,
  "cancel" : "CANCELLED",
  "visit" : "VISITED",
  "enroll" : null,
  "uninstall" : null
}, {
  "userId" : "user4",
  "success" : null,
  "error" : null,
  "cancel" : null,
  "visit" : "VISITED",
  "enroll" : "ENROLLED",
  "uninstall" : null
} ]

Answer 1

您需要在此处执行几个步骤，首先您需要将filter数组缩小为仅匹配userId的元素。

function isUser(userRecord){
        return userRecord.userId === userId;
}

然后希望将map值设置为通用数据格式，将您的值转换为简单的1或0。

function createSummaryRecords(userRecord){
    return {
        "userId" : userRecord.userId,
        "success" : !userRecord.success ? 0 : 1,
        "error" : !userRecord.error ? 0 : 1,
        "cancel" : !userRecord.cancel ? 0 : 1,
        "visit" : !userRecord.visit ? 0 : 1,
        "enroll" : !userRecord.enroll ? 0 : 1,
        "uninstall" : !userRecord.uninstall ? 0 : 1
    };
}

然后希望reduce数组到用户条目的摘要。

function sumarize(previousValue, currentValue){
    return {
        "userId" : currentValue.userId,
        "success" : previousValue.success + currentValue.success,
        "error" : previousValue.error + currentValue.error,
        "cancel" : previousValue.cancel + currentValue.cancel,
        "visit" : previousValue.visit + currentValue.visit,
        "enroll" : previousValue.enroll + currentValue.enroll,
        "uninstall" : previousValue.uninstall + currentValue.uninstall
    }
}

链接示例：

allUsersEntries
    .filter(isUser)
    .map(createSummaryRecords)
    .reduce(sumarize);

https://jsfiddle.net/po6nry25/1/

虽然具有自己属性的foreach在这种情况下可能更有效，但这种方法允许您记录您的意图，并允许您改变您的实现以检查{{1}中的特定值步骤。

如何识别重复值并使用javascript从JSON中获取唯一值的计数列表

1 个答案: