当您有很多数组元素时，过滤数据以在 react-chartjs-2 中更加可视化数据

问题描述

我想在我的图表上获得适当的可视化数据，但它很混乱，因为有 1000 个数组元素。我不想减少数据，但实际上是为了获得适当的可视化，因为在图表的 x 轴上它显示的是 NaN 值。

fetch("./data.json")
      .then((res) => {
        return res.json();
      })
      .then((data) => {
        console.log(data);
        for (const dataObj of data) {
          empSal.push(parseInt(dataObj.intensity));
          empAge.push(parseInt(dataObj.start_year));
        }.catch((err) => {
    console.log(err);
  });

(1000) [{…},{…}, …]

样本数据（data.json）：

 [
        {
            "end_year": "","intensity": 6,"sector": "Energy","topic": "gas","insight": "Annual Energy Outlook","url": "http://www.eia.gov/outlooks/aeo/pdf/0383(2017).pdf","region": "northern America","start_year": "","impact": "","added": "January,20 2017 03:51:25","published": "January,09 2017 00:00:00","country": "United States of America","relevance": 2,"pestle": "Industries","source": "EIA","title": "U.S. natural gas consumption is expected to increase during much of the projection period.","likelihood": 3
        },

....

希望输出为：

解决方法

您可以filter data 数组同时具有 start_year 和 intensity 以及 map 两个值：

const intensity = data.filter(el => el.intensity && el.start_year).map(val => val.intensity);
const year = data.filter(el => el.intensity && el.start_year).map(val => val.start_year);

使用这两个，您可以根据您的要求绘制图形

样本数据过滤示例here