创建一个未排序的数组，其中包含重复元素和唯一元素的总和

I am trying to create a new array from existing array. Condition is that if element is duplicate then sum those elements. Please see below example for details as may be I am not able to explain clearly:

我正在尝试从现有数组创建一个新的数组。条件是，如果元素是重复的，那么将这些元素相加。详情请见下面的例子，可能我无法解释清楚:

Input:

输入:

var arrayA = ["2", "1", "4", "2", "5", "1", "3", "2"];

Output:

输出:

var arrayB = ["6", "2", "4", "5", "3"];

here arrayB[0] = sum of 2s (2+2+2), arrayB[1] = sum of 1s (1+1)

这里arrayB[0] = 2s(2+2+2)之和，arrayB[1] = 1s(1+1)之和

I tried a lot but not able to figure out how I can achieve this.

我尝试了很多，但没能找到我能做到的方法。

Please help!

请帮助!

5 个解决方案

#1

You can do it this way

你可以这样做

 arrayA = ["2", "1", "4", "2", "5", "1", "3", "2"];
 //make a set 
 var set =  new Set(arrayA);
 var arrayB = [];
 set.forEach(function(a) {
   //for each set find in the original arrayA
   var len = arrayA.filter(function(f) {
     return f == a;
   });
   //push in arrayB set element * number of it occurance in original array
   arrayB.push((+a) * (len.length));
 })
 console.log(arrayB)

5 个解决方案

#1

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