how to insert value in first slice index in golang

huangapple
go评论112阅读模式
英文:

how to insert value in first slice index in golang

问题

我有一个结构体和数组切片。

  1. type Book struct {
  2. 	bookName string
  3. 	category string
  4. 	creator  string
  5. }
  7. var books = []Book{
  8. 	{bookName: "study go", category: "programming", creator: "steve"},
  9. 	{bookName: "study html", category: "programming", creator: "jobs"},
  10. }
  12. func main() {
  14. //如何将数据添加到索引[0]或books的前面
  16. }
英文:

i have an struct & array slice

  1. type Book struct {
  2. 	bookName string
  3. 	category string
  4. 	creator  string
  5. }
  7. var books = []Book{
  8. 	{bookName: "study go", category: "programming", creator: "steve"},
  9. 	{bookName: "study html", category: "programming", creator: "jobs"},
  10. }
  12. func main() {
  14. //how to add data to index[0] or front of books
  16. }

答案1

得分: 0

这样怎么样？

  1. package main
  3. import "fmt"
  5. func test() {
  6.     books = append([]Book{{
  7.         bookName: "学习C++",
  8.         category: "编程",
  9.         creator:  "tmp",
  10.     }}, books...)
  11.     fmt.Println(books)
  12. }
英文:

How about this?

  1. package main
  3. import "fmt"
  5. func test() {
  6. 	books = append([]Book{{
  7. 		bookName: "study c++",
  8. 		category: "programing",
  9. 		creator:  "tmp",
  10. 	}}, books...)
  11. 	fmt.Println(books)
  12. }

答案2

得分: -1

你的问题没有明确。我已经尝试给你一个答案。我将books变量中的第一个索引与new变量中的其他数据组合在一起。

  1. package main
  3. import "fmt"
  5. type Book struct {
  6. 	bookName string
  7. 	category string
  8. 	creator  string
  9. }
  11. func main() {
  12. 	var books = []Book{
  13. 		{bookName: "study go", category: "programming", creator: "steve"},
  14. 		{bookName: "study html", category: "programming", creator: "jobs"},
  15. 	}
  16. 	var new = []Book{
  17. 		{bookName: "study css", category: "Styling", creator: "john"},
  18. 	}
  19. 	new = append(books[0:2], new[0])
  20. 	fmt.Println(new)
  21. }

结果

  1. [{study go programming steve} {study html programming jobs} {study css Styling john}]
英文:

Your question is not clarified. I have tried to give you an answer. I combined the first index in the books variable with other data in the new variable.

  1. package main
  3. import "fmt"
  5. type Book struct {
  6. 	bookName string
  7. 	category string
  8. 	creator  string
  9. }
  11. func main() {
  12. 	var books = []Book{
  13. 		{bookName: "study go", category: "programming", creator: "steve"},
  14. 		{bookName: "study html", category: "programming", creator: "jobs"},
  15. 	}
  16. 	var new = []Book{
  17. 		{bookName: "study css", category: "Styling", creator: "john"},
  18. 	}
  19. 	new = append(books[0:2], new[0])
  20. 	fmt.Println(new)
  21. }

Result

  1. [{study go programming steve} {study html programming jobs} {study css Styling john}]

huangapple
  • 本文由 发表于 2021年9月17日 09:03:48
  • 转载请务必保留本文链接：https://go.coder-hub.com/69216663.html
  • arrays
  • go
  • struct
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