javascript - 我有一百年每个月的温度数据。如何计算每年的平均气温？

Question

我知道这是一个菜鸟问题，对此深表歉意。但是我有以下格式的数据列表:

{
    "Year": 1881,
    "Jan": -8,
    "Feb": -13,
    "Mar": 2,
    "Apr": -2,
    "May": -3,
    "Jun": -27,
    "Jul": -5,
    "Aug": -1,
    "Sep": -8,
    "Oct": -18,
    "Nov": -25,
    "Dec": -14,
    "J-D": -10,
    "D-N": -11,
    "DJF": -13,
    "MAM": -1,
    "JJA": -11,
    "SON": -17
},
{
    "Year": 1882,
    "Jan": 10,
    "Feb": 10,
    "Mar": 2,
    "Apr": -19,
    "May": -17,
    "Jun": -24,
    "Jul": -9,
    "Aug": 5,
    "Sep": 0,
    "Oct": -21,
    "Nov": -20,
    "Dec": -24,
    "J-D": -9,
    "D-N": -8,
    "DJF": 2,
    "MAM": -11,
    "JJA": -9,
    "SON": -14
},

等等

我想计算每年的平均气温。有超过100年。最简单的方法是什么？将它们放在数组中，然后手动计算它们会花费太长时间。即便如此，我也不知道如何分配每年的平均温度。我可以用什么方式编写这段代码？我正在使用 Javascript。

Answer 1

首先，您需要一个键数组来表示月份(这样您就可以忽略所有其他数据)

let months = ['Jan', 'Feb', 'Mar', ...];

然后，假设您的数据在实际数组中，您可以使用 reduce operation (好吧，两个 reduce 操作)来生成年均值的 map

let years = [{"Year":1881,"Jan":-8,"Feb":-13,"Mar":2,"Apr":-2,"May":-3,"Jun":-27,"Jul":-5,"Aug":-1,"Sep":-8,"Oct":-18,"Nov":-25,"Dec":-14,"J-D":-10,"D-N":-11,"DJF":-13,"MAM":-1,"JJA":-11,"SON":-17},{"Year":1882,"Jan":10,"Feb":10,"Mar":2,"Apr":-19,"May":-17,"Jun":-24,"Jul":-9,"Aug":5,"Sep":0,"Oct":-21,"Nov":-20,"Dec":-24,"J-D":-9,"D-N":-8,"DJF":2,"MAM":-11,"JJA":-9,"SON":-14}];

let months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'];

let averages = years.reduce((avgs, year) => {
    let sum = months.reduce((avg, month) => avg + year[month], 0);
    avgs[year.Year] = sum / months.length;
    return avgs;
}, {});

document.write('<pre>' + JSON.stringify(averages, null, '  ') + '</pre>');