You can easily sort slices of structs in Go 1.21+ using the generic packages slices and cmp.
How cmp.Compare works
cmp.Compare(a, b) returns:
- `-1` if `a < b`
- `0` if `a == b`
- `1` if `a > b`
It’s perfect for concise custom comparators in sorting functions.
Example: Sorting structs
import (
"cmp"
"slices"
)
type Book struct {
Title string
Year int
}
books := []Book{
{"The Go Programming Language", 2015},
{"Learning Go", 2021},
{"Introducing Go", 2016},
}
// Sort books by Year (ascending)
slices.SortFunc(books, func(a, b Book) int {
return cmp.Compare(a.Year, b.Year)
})
// Sort books by Title (ascending)
slices.SortFunc(books, func(a, b Book) int {
return cmp.Compare(a.Title, b.Title)
})
No need to implement sort.Interface or manage index logic manually—just use generics!
