Javascript:多维数组中的group和sum值如何

Question

我有这样一个数组:

我想分组并获得每次重复的总和,如下所示:

• AGE270:9
• AGE203:5
• AGE208:9
• ...
• AGEXXX:n

Answer 1

使用Array.prototype.reduce函数的简单解决方案:

// 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])

初始值

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