我從 JSON 文件中填充了這兩個結(jié)構(gòu)：type transaction struct { Datetime time.Time `json:"datetime"` Desc string `json:"desc"` Cash decimal.Decimal `json:"cash"`}type branch struct { BranchName string `json:"branch-name"` Currency string `json:"currency"` Deposits []transaction `json:"deposits"` Withdrawals []transaction `json:"withdrawals"` Fees []transaction `json:"fees"`}我需要實現(xiàn)一個方法來返回 和 的所有字段的總和，Cash但Deposits我不確定如何將它們抽象為“帶有字段的事物切片”。我當(dāng)前的實現(xiàn)只是重復(fù)相同的代碼三遍：WithdrawalsFeesCashfunc (b branch) getCash(datetime time.Time) decimal.Decimal { cash := decimal.NewFromFloat(0) for _, deposit := range b.Deposits { if deposit.Datetime.Before(datetime) { cash = cash.Add(deposit.Cash) } } for _, withdrawal := range b.Withdrawals { if withdrawal.Datetime.Before(datetime) { cash = cash.Add(withdrawal.Cash) } } for _, fee := range b.Fees { if fee.Datetime.Before(datetime) { cash = cash.Add(fee.Cash) } } return cash}有一個更好的方法嗎？
2 回答
慕田峪4524236
TA貢獻1875條經(jīng)驗 獲得超5個贊
通過循環(huán)切片切片來消除重復(fù)代碼：
for _, transactions := range [][]transaction{b.Deposits, b. Withdrawals, b.Fees} {
for _, transaction := range transactions {
if transaction.Datetime.Before(datetime) {
cash = cash.Add(transaction.Cash)
}
}
}
白衣非少年
TA貢獻1155條經(jīng)驗 獲得超0個贊
您可以附加到一個數(shù)組并對其進行迭代：
func (b branch) getCash(datetime time.Time) decimal.Decimal {
cash := decimal.NewFromFloat(0)
arr := append(b.Deposits, b.Fees...)
arr = append(arr, b.Withdrawals...)
for _, a := range arr {
if a.Datetime.Before(datetime) {
cash = cash.Add(a.Cash)
}
}
return cash
}
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