package main import ( "fmt" "sort" ) type Grams int func (g Grams) String() string { return fmt.Sprintf("%dg", int(g)) } type Organ struct { Name string Weight Grams } type Organs []*Organ func (s Organs) Len() int { return len(s) } func (s Organs) Swap(i, j int) { s[i], s[j] = s[j], s[i] } // ByName implements sort.Interface by providing Less and using the Len and // Swap methods of the embedded Organs value. type ByName struct{ Organs } func (s ByName) Less(i, j int) bool { return s.Organs[i].Name < s.Organs[j].Name } // ByWeight implements sort.Interface by providing Less and using the Len and // Swap methods of the embedded Organs value. type ByWeight struct{ Organs } func (s ByWeight) Less(i, j int) bool { return s.Organs[i].Weight < s.Organs[j].Weight } func main() { s := []*Organ{ {"brain", 1340}, {"heart", 290}, {"liver", 1494}, {"pancreas", 131}, {"prostate", 62}, {"spleen", 162}, } sort.Sort(ByWeight{s}) fmt.Println("Organs by weight:") printOrgans(s) sort.Sort(ByName{s}) fmt.Println("Organs by name:") printOrgans(s) } func printOrgans(s []*Organ) { for _, o := range s { fmt.Printf("%-8s (%v)\n", o.Name, o.Weight) } }
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