Question

这是我的json文件的一部分

     {
      "articles": [
        {
          "rank": "1",
          "title": "Harvard University",
          "country": "USA",
          "score": "100.00"
        },
        {
          "rank": "3",
          "title": "Massachusetts Institute of Technology",
          "country": "USA",
          "score": "97.12"
        },
        {
          "rank": "5",
          "title": "University of Oxford",
          "country": "United Kingdom",
          "score": "95.39"
        },
        {
          "rank": "36",
          "title": "École Polytechnique",
          "country": "France",
          "score": "59.09", 
        },
        {
          "rank": "904",
          "title": "University of Basilicata",
          "country": "Italy",
          "score": "44.31",
        }
        ]
    }

我想计算具有JS功能的相同国家/地区的数量来制作Google图表。我需要这样的结果： country:{"USA" : 57,"Japan" : 23,"United Kingdom" : 38,"

另一个函数将返回分数大于80且小于80的大学数量，如下所示： score:{"morethan80" : 195,"lessthan80" : 805,"

Answer 1

你需要做的是循环你的地图，检查它是否符合你的条件，如果是，就增加它。

通常情况下，reduce会根据您的需要输入和输出数组：https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/Reduce

const output = data.articles.reduce(
  (result, article) => ({
    country: {
      ...result.country,
      [article.country]: result[article.country] ? result[article.country] + 1 : 1,
    },
    score: {
      morethan80: parseInt(article.score) >= 80 ? result.morethan80 + 1 : result.morethan80,
      lessthan80: parseInt(article.score) < 80 ? result.lessthan80 + 1 : result.lessthan80,
    }
  }),
  { country: {}, score: { morethan80: 0, lessthan80: 0 }}
);

告诉我你是否需要更多关于答案的细节。

如何用JS在json文件中计算相同的值

1 个答案: