我怎样才能找到对象数组中的最高和最低/ Javascript

Question

我是js新手，你能帮我找到对象数组中的最高温度和最低温度吗

let weather = [
  { month: 'March',   temperature: [2,5,4,3,7,12]},
  { month: 'April', temperature: [14,15,16,19, 20]},
  { month: 'May',   temperature: [22,24,26,28,27]}
]

Answer 1

我改变了对象并在对象本身中添加了 lowest、'highest' 和 'average'。

为了获得 month 和 temperature，我使用了 object destructuring。

然后使用 sort 函数对数组进行排序。

现在 tempArray 已排序，索引 0 处的元素是 lowest，temporary.length - 1 处的元素是最高元素。

为了获取数组的平均值，我使用了数组 reduce 函数。

let weather = [
  { month: "March", temperature: [2, 5, 4, 3, 7, 12] },
  { month: "April", temperature: [14, 15, 16, 19, 20] },
  { month: "May", temperature: [22, 24, 26, 28, 27] },
];

let getAverage = (array) => array.reduce((a, b) => a + b) / array.length;

weather.forEach((monthData) => {
  const { month, temperature } = monthData;
  
  // temporary sorted array
  const tempArray = [...temperature].sort((a, b) => a - b);
  
  // Lowest
  monthData.lowest = tempArray[0];
  
  // Heighest
  monthData.highest = tempArray[tempArray.length - 1];
  
  // Average
  monthData.average = getAverage(tempArray);
});

console.log(weather);

const averageArray = weather
  .map((month) => month.average)
  .sort((a, b) => a - b);

const lowestInAverage = averageArray[0];
const highestInAverage = averageArray[averageArray.length - 1];

console.log(lowestInAverage, highestInAverage);

Answer 2

使用地图和减少。内部地图回调使用 Math.max & Math.min 查找最高和最低温度，并使用 sort 按平均温度的升序对数组进行排序

let weather = [{
    month: 'March',
    temperature: [2, 5, 4, 3, 7, 12]
  },
  {
    month: 'April',
    temperature: [14, 15, 16, 19, 20]
  },
  {
    month: 'May',
    temperature: [22, 24, 26, 28, 27]
  }
]

const val = weather.map(item => {
  return {
    month: item.month,
    temperature: item.temperature,
    lowest: Math.min(...item.temperature),
    highest: Math.max(...item.temperature),
    avgTemp: item.temperature.reduce((acc, curr) => {
      return (acc + curr)
    }, 0) / item.temperature.length
  }
}).sort((a, b) => a.avgTemp - b.avgTemp)
console.log(val)

我怎样才能找到对象数组中的最高和最低/ Javascript

How can I find highest and lowest in an array of objects/ Javascript

javascript

arrays

average

object