javascript 计算对象数组中的重复项
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Count duplicates within an Array of Objects
提问by Ben
I have an array of objects as follows within my server side JS:
我的服务器端 JS 中有一个对象数组，如下所示：
[
{
"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.
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。
Both of the values must match to qualify as a duplicate e.g. "Company": "IBM" is not a match for "Company": "MSFT".
这两个值必须匹配才能成为重复项，例如“公司”：“IBM”与“公司”：“MSFT”不匹配。
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.
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。
EDIT: Here is the code I have so far where processArray is the array as listed above.
编辑：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 < 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));
回答by georg
For example:
例如：
counter = {}
yourArray.forEach(function(obj) {
var key = JSON.stringify(obj)
counter[key] = (counter[key] || 0) + 1
})
Docs: Array.forEach, JSON.stringify.
回答by gion_13
Object.prototype.equals = function(o){
for(var key in o)
if(o.hasOwnProperty(key) && this.hasOwnProperty(key))
if(this[key] != o[key])
return false;
return true;
}
var array = [/*initial array*/],
newArray = [],
ok = true;
for(var i=0,l=array.length-1;i<l;i++)
for(var j=i;j<l+1;j++)
{
if(!array[i].equals(array[j]))
newArray.push(array[i]);
}
