如何从单个模型日期1生成一个日期从1到10的模型切片？

huangapple
go评论104阅读模式
英文:

How to generate a slice of model with date running from 1 to 10, from a single model date 1?

问题

我实际上有一个类似的模型

  1. type Price struct {
  2.    Type  string 
  3.    Date  time.Time
  4.    Price float64
  5. }
  7. inputTime, _ := time.Parse("2006-01-02", "2022-01-01")
  8. priceOnDate := Price{
  9.     Type:  "A",
  10.     Date:  inputTime,
  11.     Price: 12.23,
  12. }

从这个模型中，我想生成一个从1月1日到1月5日的模型切片。手动操作的话，我需要这样做

  1. inputTime, _ := time.Parse("2006-01-02", "2014-11-12")
  2. priceOnDate := Price{
  3.     Type:  "A",
  4.     Date:  inputTime,
  5.     Price: 12.23,
  6. }
  7. var listOfPrice []Price
  9. for i := 1; i < 5; i++ {
  10.     tempPriceOnDate := priceOnDate
  11.     tempPriceOnDate.Date = inputTime.Add(time.Hour * time.Duration(24*i))
  12.     listOfPrice = append(listOfPrice, priceOnDate)
  13. }
  14. fmt.Println(listOfPrice)

然而，我觉得这种方法并不是很优化。我相信有一些包可以支持这样做。

英文:

I actually have a model like this

  1. type Price struct {
  2.    Type  string 
  3.    Date  time.Time
  4.    Price float64
  5. }
  7. inputTime, _ := time.Parse(&quot;2006-01-02&quot;, &quot;2022-01-01&quot;)
  8. priceOnDate := Price{
  9. 	Type:  &quot;A&quot;,
  10. 	Date:  inputTime,
  11. 	Price: 12.23,
  12. }

From that I want to generate a slice of Model from day 1 January to day 5 January. Manually I have to do

  1. inputTime, _ := time.Parse(&quot;2006-01-02&quot;, &quot;2014-11-12&quot;)
  2. priceOnDate := Price{
  3. 	Type:  &quot;A&quot;,
  4. 	Date:  inputTime,
  5. 	Price: 12.23,
  6. }
  7. var listOfPrice []Price
  9. for i := 1; i &lt; 5; i++ {
  10. 	tempPriceOnDate := priceOnDate
  11. 	tempPriceOnDate.Date = inputTime.Add(time.Hour * time.Duration(24*i))
  12. 	listOfPrice = append(listOfPrice, priceOnDate)
  13. }
  14. fmt.Println(listOfPrice)

However, I feel that it is not very optimized. I believe there are packages that support doing so.

答案1

得分: 1

一些技巧：

  • 你可以直接在循环中构建所有的值。
  • 你可以预先分配好切片的大小，因为你知道它将有多少个值。
  • 你可以使用 time.AddDate。
  1. inputTime := time.Date(2014, 11, 12, 0, 0, 0, time.UTC)
  2. nDays := 5
  3. listOfPrice := make([]Price, nDays)
  4. for i := 0; i < nDays; i++ {
  5.   listOfPrice[i] = Price{
  6.     Type: "A",
  7.     Date: inputTime.AddDate(0, 0, i),
  8.     Price: 12.23,
  9.   }
  10. }
英文:

A few tricks:

  • You could just construct all the values in the loop directly.
  • You can pre-allocate your slice since you know how many values it will have.
  • You can use time.AddDate.
  1. inputTime := time.Date(2014, 11, 12, 0, 0, 0, time.UTC)
  2. nDays := 5
  3. listOfPrice := make([]Price, nDays)
  4. for i := 0; i &lt; nDays; i++ {
  5.   listOfPrice[i] = Price{
  6.     Type: &quot;A&quot;,
  7.     Date: inputTime.AddDate(0, 0, i),
  8.     Price: 12.23,
  9.   }
  10. }

huangapple
  • 本文由 发表于 2022年11月9日 13:05:37
  • 转载请务必保留本文链接：https://go.coder-hub.com/74370134.html
  • go
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