How can you sort an array of structs in Go?

In Go, to sort an array of structs, you can use the sort package. You need to implement the sort.Interface, which requires three methods: Len(), Less(i, j int) bool, and Swap(i, j int).

Example of sorting a slice of structs by one of the fields:

package main

import (
    "fmt"
    "sort"
)

type Person struct {
    Name string
    Age  int
}

type ByAge []Person

func (a ByAge) Len() int           { return len(a) }
func (a ByAge) Swap(i, j int)      { a[i], a[j] = a[j], a[i] }
func (a ByAge) Less(i, j int) bool { return a[i].Age < a[j].Age }

func main() {
    people := []Person{
        {"Alice", 30},
        {"Bob", 25},
        {"Charlie", 35},
    }

    sort.Sort(ByAge(people))

    fmt.Println(people)
}

As a result, the people slice will be sorted by age.