回答編集履歴
2
追記
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@@ -23,3 +23,27 @@
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なお、本題から外れますが、その所得税の計算式間違えてますのでお気を付けください。控除はそこから引くんじゃないです。
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[所得税の税率｜所得税｜国税庁](https://www.nta.go.jp/taxanswer/shotoku/2260.htm)
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追記
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```lang-javascript
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function calcTax(income) {
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return [
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{income:0, rate:0},
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{income:1950000, rate:0.05},
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{income:3300000, rate:0.10},
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{income:6950000, rate:0.20},
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{income:9000000, rate:0.23},
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{income:18000000, rate:0.33},
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{income:40000000, rate:0.40},
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{income:Infinity, rate:0.45}
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].reverse().reduce(function(r, c){
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return {
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sum: r.sum + Math.max( r.income - c.income, 0 ) * r.prev.rate,
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income: Math.min( c.income, r.income),
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prev: c
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}
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},{sum:0, income:income, prev:{income:0, rate:0}}).sum
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}
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```
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コードの修正
answer
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@@ -17,7 +17,7 @@
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sum: r.sum + Math.max( r.income - taxRate[i+1].income, 0 ) * c.rate,
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income: Math.min( taxRate[i+1].income, r.income)
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}
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},{sum:0, income:income})
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},{sum:0, income:income}).sum
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}
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```
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