计算对象数组中的重复项 [英] Count duplicates within an Array of Objects

问题描述

我的服务器端 JS 中有一个对象数组，如下所示:

<预><代码>[{公司":IBM"},{人":ACORD LOMA"},{公司":IBM"},{公司":MSFT"},{地点":纽约"}]

我需要遍历这个结构，检测任何重复项，然后在每个值旁边创建一个重复项的计数.

两个值必须匹配才能被视为重复，例如公司":IBM"与公司":MSFT"不匹配.

如果需要，我可以选择更改入站对象数组.我希望输出是一个对象，但我真的很难让它工作.

这是我到目前为止的代码，其中 processArray 是上面列出的数组.

var returnObj = {};for(var x=0; x 

解决方案

例如:

计数器 = {}yourArray.forEach(function(obj) {var key = JSON.stringify(obj)计数器[密钥] = (计数器[密钥] || 0) + 1})

文档:Array.forEach、JSON.stringify.

I have an array of objects as follows within my server side JS:

[
    {
        "Company": "IBM"
    },
    {
        "Person": "ACORD LOMA"
    },
    {
        "Company": "IBM"
    },
    {
        "Company": "MSFT"
    },
    {
        "Place": "New York"
    }
]

I need to iterate through this structure, detect any duplicates and then create a count of a duplicate is found along side each value.

Both of the values must match to qualify as a duplicate e.g. "Company": "IBM" is not a match for "Company": "MSFT".

I have the options of changing the inbound array of objects if needed. I would like the output to be an object, but am really struggling to get this to work.

EDIT: Here is the code I have so far where processArray is the array as listed above.

var returnObj = {};

    for(var x=0; x < processArray.length; x++){

        //Check if we already have the array item as a key in the return obj
        returnObj[processArray[x]] = returnObj[processArray[x]] || processArray[x].toString();

        // Setup the count field
        returnObj[processArray[x]].count = returnObj[processArray[x]].count || 1;

        // Increment the count
        returnObj[processArray[x]].count = returnObj[processArray[x]].count + 1;

    }
    console.log('====================' + JSON.stringify(returnObj));

解决方案

For example:

counter = {}

yourArray.forEach(function(obj) {
    var key = JSON.stringify(obj)
    counter[key] = (counter[key] || 0) + 1
})

Docs: Array.forEach, JSON.stringify.

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