如何访问 javascript/typescript 中的重复计数

Question

我有一个数据数组 => this.allNodeSets。对于这个数组，我找到了重复项。现在我想找到重复的数量。找到重复计数的唯一方法是 say => itemCount.ball

伪代码 -

var randomArray = ["ball", "ball", "tree", "ball", "tree", "bus", "car"];
var itemCount = {};

randomArray.forEach(function(value){
    if(value in itemCount) itemCount[value] = itemCount[value] + 1;
    else itemCount[value] = 1;
}); 

要找到计数 - 做 =>

 itemCount.ball 

我发现很难像上面那样找到这个个人计数。 我的代码 -

app.component.ts - Angular2+

callFunctionSingleSelectedResult(){

allNodeSets = [
 ["claimIntimationRequestBody", "claimIntimationRequestHeader"],
 ["claimIntimationRequestBody", "claimIntimationRequestHeader"],
 ["claimIntimationRequestBody", "claimIntimationRequestBody"],
["claimIntimationRequestBody", "claimIntimationRequestHeader"],
 ["claimIntimationRequestBody", "claimIntimationResponseBody"],
 ["claimIntimationRequestHeader", "claimIntimationRequestBody"],
 ["claimIntimationRequestHeader", "claimIntimationRequestHeader"],
 ["claimIntimationRequestHeader", "claimIntimationResponseBody"],

 ["claimIntimationRequestBody", "claimIntimationRequestHeader"],

 ["claimIntimationRequestBody", "claimIntimationResponseBody"],
 ["claimIntimationRequestHeader", "claimIntimationResponseBody"],
]


       var duplicateResult = this.findDuplicates(this.allNodeSets);

       console.log("inside duplicates, result= ", duplicateResult);



//------------[1] count duplicates


              var itemCount = {};

              duplicateResult.forEach(function (value) {
                if (value in itemCount)
                  itemCount[value] = itemCount[value] + 1;
                else itemCount[value] = 1;


              });

              console.log("duplicateResult, forEach = count = ", 
           itemCount)

              for (var i = 0; i < duplicateResult.length; i++) {

                console.log(" individual count = ", itemCount)
              }

}


 // finding Duplicates

  findDuplicates(arr) {
    var len = arr.length,
      out = [],
      counts = {};

    for (var i = 0; i < len; i++) {
      var item = arr[i];
      counts[item] = counts[item] >= 1 ? counts[item] + 1 : 1;
      if (counts[item] > 1) {
        out.push(item);
      }
    }

    return out;
  }

  // Function duplicate ends

输出 -

 duplicateResult = 
    [ 
    ["claimIntimationRequestBody","claimIntimationRequestHeader"],
    ["claimIntimationRequestBody", "claimIntimationRequestHeader"], 
    ["claimIntimationRequestBody","claimIntimationRequestHeader"] ,
    ["claimIntimationRequestBody","claimIntimationResponseBody"],
    ["claimIntimationRequestHeader", "claimIntimationResponseBody"] , 
    ["claimIntimationRequestHeader" "claimIntimationResponseBody"] 
    ]



    duplicate count, counter = {["claimIntimationRequestBody","claimIntimationRequestHeader"]: 3, 

["claimIntimationRequestBody","claimIntimationRequestBody"]: 1, 

["claimIntimationRequestBody","claimIntimationResponseBody"]: 1}

我搜索了整个网络，但没有其他工作方式可以让我确定以其他方式给出计数的代码。请帮助确定获取节点数的方法，或者也许这里有一种获取节点数的方法。我无法这样做。

如果我这样做 -

 for (var i = 0; i < duplicateResult.length; i++) {

                console.log(" individual count = ", itemCount.duplicateResult)
              }

我收到错误 -

Property 'duplicateResult' does not exist on type '{}'.

参考-

How to check if the elements in an array are repeated?

Answer 1

var randomArray = ["ball", "ball", "tree", "ball", "tree", "bus", "car"];
var counts = {};
randomArray.forEach(function(x) { counts[x] = (counts[x] || 0)+1; });
console.log(counts)

这是一个工作示例，希望对您有所帮助

Answer 2

 var input= [ 
            ["claimIntimationRequestBody","claimIntimationRequestHeader"],
            ["claimIntimationRequestBody", "claimIntimationRequestHeader"], 
            ["claimIntimationRequestBody","claimIntimationRequestHeader"] ,
            ["claimIntimationRequestBody","claimIntimationResponseBody"],
            ["claimIntimationRequestHeader", "claimIntimationResponseBody"] , 
            ["claimIntimationRequestHeader", "claimIntimationResponseBody"] 
        ];
        
        var output = {};
        
        input.forEach(item => {
            // key is combination of all values of subarray  
            let key = item.join("_");
            if(!output[key]) output[key] = 0;
            output[key] +=1;
          }
        )
        console.log(output)