Javascript : How group and sum values from multidimensional array

Question

我有一个这样的数组:



我想分组并得到每次重复的总和，如下所示:

年龄270: 9

年龄203: 5

年龄208: 9

...

AGEXXX: n

Answer 1

使用 Array.prototype.reduce 的简单解决方案功能:

// Replace arr with your actual array!
var arr = [
        { AGENDADOR: 'AGE270', TOTAL : 6},
        { AGENDADOR: 'AGE270', TOTAL : 3},
        { AGENDADOR: 'AGE203', TOTAL : 5},
        { AGENDADOR: 'AGE028', TOTAL : 9},
    ],
  
  totals = arr.reduce(function (r, o) {
    (r[o.AGENDADOR])? r[o.AGENDADOR] += o.TOTAL : r[o.AGENDADOR] = o.TOTAL;
    return r;
  }, {});

console.log(totals);

arr.reduce(callback, [initialValue])

initialValue

Optional. Value to use as the first argument to the first call of the callback.