Pass slice as function argument, and modify the original slice

by

If you want to pass a slice as a parameter to a function, and have that function modify the original slice, then you have to pass a pointer to the slice:

func myAppend(list *[]string, value string) {
    *list = append(*list, value)
}

I have no idea if the Go compiler is naive or smart about this; performance is left as an exercise for the comment section.

For junior coders out there, please note that this code is provided without error checking. For example, this code will panic if list is nil.

More Related Contents:

  1. How to avoid non reachable code with switch-case?
  2. Stop code execution after redirect
  3. Unable to install gRPC for go in mac os
  4. What’s the meaning of interface{}?
  5. Multiple values in single-value context
  6. How to initialize a nested struct?
  7. how to reference a relative file from code and tests
  8. Iterate through the fields of a struct in Go
  9. If Go’s interfaces aren’t enforced, are they necessary?
  10. How to set default values in Go structs
  11. What are channels used for?
  12. Cross compile Go on OSX?
  13. Convert between slices of different types
  14. Is it possible get information about caller function in Golang?
  15. How do I get the local IP address in Go?
  16. Max number of goroutines
  17. How to assign or return generic T that is constrained by union?
  18. Go fails to infer type in assignment: “non-name on left side of :=”
  19. Does Go have standard Err variables?
  20. Reason for huge size of compiled executable of Go
  21. Specs: What’s the purpose of the blank identifier in variable assignment? [duplicate]
  22. Why does golang compiler think the variable is declared but not used?
  23. Why can’t I append to a slice that’s the property of a struct in golang?
  24. How to write a generic function that accepts any numerical type?
  25. How do you serve a static html file using a go web server?
  26. Meaning of a struct with embedded anonymous interface?
  27. Does Go have lambda expressions or anything similar?
  28. How to disable “use of internal package not allowed”
  29. How to iterate over a union of slices passed in a generic function? (T has no core type)
  30. Registering packages in Go without cyclic dependency

Leave a Comment