Question

我有一个这样的对象

CalculatorActivity myActivity = (CalculatorActivity)getActivity()
myActivity.setInputValues(fragmentInputValues)
myActivity.doSomethingWithTheValues()

我希望考试年份内的“心理能力”之类的数据应显示为

{
"Mental Ability": [
    {
      "_id": "1",
      "exams": [
        {
          "_e": "12",
          "years": [
            {
              "y": 2012,
              "freq": 3
            },
            {
              "y": 2011,
              "freq": 3
            }
          ]
        }
      ]
    },
    {
      "_id": "2",
      "exams": [
        {
          "_e": "12",
          "years": [
            {
              "y": 2011,
              "ques_freq": 3
            },
            {
              "y": 2012,
              "freq": 1
            }
          ]
        }
      ]
    }
  ]
}

表示应添加并显示同一年的频率就像2011年的那些考试年一样，应该对频率进行汇总和显示

Answer 1

我想“ ques_freq”是“ freq”的错字，下面的o是您提到的对象。

function count(mentalAbility) {
  let out = {};
  mentalAbility.forEach(item => {
    item.exams.forEach(exam => {
      exam.years.forEach(year => {
        out[year.y] === undefined
          ? (out[year.y] = year.freq)
          : (out[year.y] += year.freq);
      });
    });
  });
  return out;
}

console.log(count(o['Mental Ability'])); // { '2011': 6, '2012': 4 }

function format(counts) {
  return Object.keys(counts).reduce((acc, year) => {
    acc.push({
      y: year,
      freq: counts[year]
    });
    return acc;
  }, []);
}

console.log(format(count(o['Mental Ability']))); // [ { y: '2011', freq: 6 }, { y: '2012', freq: 4 } ]

请注意，我不会为字段查找添加任何未定义/ null检查

具有相同键值数据的对象

1 个答案: