过滤数组方法不适用于减少方法

问题描述

我不断收到 TypeError: countYear.filter is not a function for the last line 但我不明白为什么。我只想输出年份并计算（仅 2014 年）。这是原始代码的沙箱：https://codesandbox.io/s/wizardly-clarke-szge3

hystrix:
  command:
    default:
      circuitBreaker:
        enabled: true
        requestVolumeThreshold: 10
        sleepWindowInMilliseconds: 20000
      execution:
        timeout:
          enabled: true
        isolation:
          thread:
            timeoutInMilliseconds: 4000

const table = (data,e ) =>{
    // get array of dates when bar is clicked 
    let newArr= data.datum.dimensions[0].datum.data.results.map((d) => d.Date)
    console.log(newArr)

    // convert into Date object 
    const datesArr = newArr.map(d => ({ date: new Date(d),count : 0}))
    console.log(datesArr)


    // each year 

    const yeararr = datesArr.map((d) => ({year: d.date.getFullYear(),count: 0}))
    console.log(yeararr)
    const countYear = newArr.reduce((acc,date) => {
      const years = new Date(date).getFullYear();
      // acc = { date,count }
      if (acc[years]) {
        return {
          ...acc,[years]: {
            date: years,count: acc[years]["count"] + 1
          }
        };
      }
      return {
        ...acc,[years]: {
          date: years,count: 1
        }
      }
      
    }
    )
    countYear.filter((e) => e.includes('2014'))
  //  setYear(Object.values(countYear))
   
}

解决方法

因为 countYear 是一个对象，并且该对象没有方法过滤器。