使用 Wea​​ther API 并按日期排序

Question

我正在尝试按日期过滤数组，然后为每一天制作一个组件。对我来说最大的障碍是日期以 UTC 显示，我不确定如何将其转换为可用的格式来循环播放。除非有人提出更有效的方法，否则目标是能够对日期数据进行分组，调​​用该数组（即 firstDay[0] ）并循环遍历这些数据以找到当天的最高温度、平均湿度等。但是我认为第一步是按日期排序。即五天[0].maxtemp

JSON https://api.openweathermap.org/data/2.5/forecast?q=Austin,USA&appid=583f803dfc6a7f2f96ff9957c330c2b0&units=imperial

            var firstDay = [];
            var firstDayVar;
            for (i = 0; i < items.list.length; i++){
                let item = items.list[i].dt
                let date = new Date(item*1000)
                let dateNumber = date.getDate()
                let date_text = items.list[i].dt_txt
                // Thought this would be useful to organize by but not really applicable?
                let dateString = date_text.substring(0,10)


                console.log(dateString)
                //outputs yyyy-mm-dd
                if (firstDayVar === undefined){
                    firstDayVar = dateNumber
                } else if (firstDayVar !== dateNumber) {
                    firstDayVar = dateNumber
                    firstDay.push(firstDayVar);
            }
        }

Answer 1

这就是我根据日期对您的数据进行分组的方式。现在您可以根据日期循环它们，每个日期都有一个来自您的 api 列表属性的原始对象数组。

该 api 为您提供 [DATE]_[TIME] 的数组项，我们的目标是将相同的日期分组到 [DATE] 的字典中，其中每个单独的日期将包含原始项目的列表（针对该特定日期）

[ D1.T1, D1.T2, D2.T1, D3.T1, D3.T2, D3.T3 ] // 原始项目数组

.

{ D1: [D1.T1, D1.T2], D2: [D2.T1], D3: [D3.T1, D3.T2, D3.T3] } // 对象按日期分组项目

如果您仔细观察，我们的想法是确保您的数据安全，从而确保您的原始结构安全。现在，您循环分组数据的键，您可以访问单个日期的所有项目。

fetch('https://api.openweathermap.org/data/2.5/forecast?q=Austin,USA&appid=583f803dfc6a7f2f96ff9957c330c2b0&units=imperial').then(response => response.json()).then(data => {
  const groupedData = data.list.reduce((days, row) => {
    const date = row.dt_txt.split(' ')[0];
    days[date] = [...(days[date] ? days[date]: []), row];
    return days;
  }, {});
  
  for(let date of Object.keys(groupedData)){
    console.log('Date:', date); 
    // current date -> date
    // original items array for this date -> groupedData[date]
    console.log('RowCount:', groupedData[date].length);
    console.log('MaxTemp:', getMax(groupedData[date], 'temp_max'));
    console.log('MinTemp:', getMin(groupedData[date], 'temp_min'));
    console.log('MaxHumidity:', getMax(groupedData[date], 'humidity'));
    
    console.log('\n\n');
  }
});

function getMax(arr, attr){
  return Math.max.apply(Math, arr.map(item => item.main[attr]));
}

function getMin(arr, attr){
  return Math.min.apply(Math, arr.map(item => item.main[attr]));
}

由于您的大部分数据都在列表内的主要属性中，因此我创建了 2 个辅助函数，它们将比较所有项目并获取传递属性的最大值和最小值，例如：temp_max、temp_min、湿度等。您可以获得自己的自定义喜欢的方法。

希望这会有所帮助！

Answer 2

要获取仅包含具有特定日期字符串的对象（例如“2019-09-23”）的数组，我将使用 Array.prototype.filter 方法和 String.prototype.includes 方法来仅返回具有 dt_text 的对象包括日期字符串：

(where list is the array returned from the API)

var firstDayList = list.filter(item => item.dt_txt.includes("2019-09-23"))

Answer 3

我不确定我是否得到了你，但从外观上看，天气 API 中的 data 已经按日期按升序排列，这要归功于 dt: key all you need to do 是从列表中渲染你的组件

list.map(day => <MyAwesomeComponent 
                   maxTemp={day.main.temp_max} 
                   humidityAvg={day.main.humidity}  />)

Answer 4

我认为通过函数式方法，您可以从阅读的简单性中受益，并且在您的需求发生变化时，可以轻松确定在代码中放置更改的位置。

在下面的sn-p中，我尝试了：

• 获取数组数据
• 按年分组
• 获取每天的最高温度

当然，您可以选择输出数据结构。如果您阅读该组合，则只需更改最后一个返回数据的函数即可更改它。

我创建了一些函数来帮助我完成这个过程，尽管你可以导入一些函数库，比如 Ramda，而不必自己编写所有这些函数。希望对您有所帮助！

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/**
* FUNCTIONS TO HELP IN THE COMPOSITION
*/
const pluck = prop => obj => obj[prop];
const pipe = (...fns) => (x) => fns.reduce((v, f) => f(v), x);
const map = f => arr => arr.map(f)
const oMap = f => o => Object.assign({}, ...Object.keys(o).map(k => ({ [k]: f(o[k]) })));
const groupBy = prop => arr => {
  return arr.reduce(function(groups, item) {
    const val = item[prop];
    groups[val] = groups[val] || [];
    groups[val].push(item);
    return groups;
  }, {});
};

/**
* Function that takes an entry of the raw data array and adds a _day with the dd/mm/yyyy
*/
const addDay = item => ({...item, _day: (new Date(item.dt*1000)).toLocaleDateString()});

/**
* Function that takes an array of entries and get the max temperature in it
*/
const getMaxTempArr = arr => {
  const maxTemp = arr.reduce((acc, val) => {
    if (val.main.temp_max > acc) {
      acc = val.main.temp_max;
    }
    return acc;
  }, 0);
  return maxTemp;
}

const program = pipe(
  pluck('list'),
  map(addDay),
  groupBy('_day'),
  oMap(getMaxTempArr)
)

console.log(program(data))