计算直线下降

Question

我有资产（说车辆），今年价值1000 ......

var assetCurrentBookValue = 1000

车辆将在5年内贬值......这意味着该价值将在未来5年内变为0 ......

var assetLife = 5

年度折旧成为......

var assetYearlyDepreciation = assetCurrentBookValue / assetLife

我需要计算每年折旧之后的年度价值......

year    assetYearlyDepreciation         assetBookVaue
2016    200                                     1000
2017    200                                     800
2018    200                                     600
2019    200                                     400
2020    200                                     200
2021    200                                     0

我需要像这样转换成数组......

[
    [2016,1000],
    [2017,800],
    [2018,600],
    [2019,400],
    [2020,200],
    [2021,0]
]

这是我的解决方法......

var index = Array.from(Array(assetLife).keys());
var thisYear = new Date().getFullYear()

var assetYearlyBookValue = [[thisYear,assetCurrentBookValue]]

index.forEach((o) => {
    assetYearlyBookValue.push([o + thisYear + 1, assetCurrentBookValue - assetYearlyDepreciation])
});

但是我得到了..

[
    [2016,1000],
    [2017,800],
    [2018,800],
    [2019,800],
    [2020,800],
    [2021,800]
]

任何帮助将不胜感激...谢谢Youu ..

Answer 1

修改assetCurrentBookValue - assetYearlyDepreciation和new Date().getFullYear()的结果并将其存储到变量中，以便获得不断变化的结果：

var index = Array.from(Array(assetEconomicLife).keys());
var thisYear = new Date().getFullYear()

var assetYearlyBookValue = [[thisYear,assetCurrentBookValue]]
var lastRes = assetCurrentBookValue

index.forEach((o) => {
    lastRes -= assetYearlyDepreciation
    assetYearlyBookValue.push([o + (++thisYear), lastRes])
});