如何获取JSON文件中的特定数据

Question

我试图以JSON格式仅获取每个数据中的洞察力。我使用lodash按月过滤，但我不能只获得每个对象的洞察力。

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let insight5 = [{
    insight: "valid",
    reportMonth: "January - June 2018"
  },
  {
    insight: "invalid",
    reportMonth: "January 2018"
  },
  {
    insight: "valid",
    reportMonth: "February 2018"
  },
  {
    insight: "valid",
    reportMonth: "March 2018"
  },
  {
    insight: "valid",
    reportMonth: "April 2018"
  },
  {
    insight: "valid",
    reportMonth: "May 2018"
  },
  {
    insight: "valid",
    reportMonth: "June 2018"
  },
];


function filterData(data, month) {
  let filtered = _.filter(data, x => x.reportMonth == month)
  return filtered[0];
}

​

Answer 1

要仅获得洞察力，您需要返回该属性：

return filtered.length > 0 && filtered[0].insight;

我首先检查长度，以防找不到匹配的数据。

Answer 2

您可以使用普通的JavaScript Array.prototype.filter()和Array.prototype.map()

代码：

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const insight5 = [{insight: "valid",reportMonth: "January - June 2018"},{insight: "invalid",reportMonth: "January 2018"},{insight: "valid",reportMonth: "February 2018"},{insight: "valid",reportMonth: "March 2018"},{insight: "valid",reportMonth: "April 2018"},{insight: "valid",reportMonth: "May 2018"},{insight: "valid",reportMonth: "June 2018"}];

const getInsightForMonth = month => insight5
  .filter(o => o.reportMonth.includes(month))
  .map(o => o.insight);
  
console.log(getInsightForMonth('February'));

​

Answer 3

试试这个。

​

var desiredMonth = "February";
let insight5 = [{
    insight: "valid",
    reportMonth: "January - June 2018"
  },
  {
    insight: "invalid",
    reportMonth: "January 2018"
  },
  {
    insight: "valid",
    reportMonth: "February 2018"
  },
  {
    insight: "valid",
    reportMonth: "March 2018"
  },
  {
    insight: "valid",
    reportMonth: "April 2018"
  },
  {
    insight: "valid",
    reportMonth: "May 2018"
  },
  {
    insight: "valid",
    reportMonth: "June 2018"
  },
];


const filteredData = insight5.reduce((acc, currentValue) => {
  if (currentValue.reportMonth.includes(desiredMonth)) {
    acc.push(currentValue.insight);
  }
  return acc;
}, []);
console.log(filteredData);

​