42: Sorting

Author: symonk

README.md

@@ -61,3 +61,4 @@ go run . -module closingchannels
 * [39 - Atomic Counters](atomiccounters/main.go)
 * [40 - Mutexes](mutexes/main.go)
 * [41 - Stateful Goroutines](statefulgoroutines/main.go)
+* [42 - Sorting](sorting/main.go)

main.go

@@ -44,6 +44,7 @@ import (
 	"github.com/symonk/learning-golang/workerpools"
 	"github.com/symonk/learning-golang/mutexes"
 	"github.com/symonk/learning-golang/statefulgoroutines"
+	"github.com/symonk/learning-golang/sorting"
 )
 
 func main() {
@@ -112,5 +113,6 @@ func buildMap() map[string]func() {
 	fnMap["atomiccounters"] = atomiccounters.Run
 	fnMap["mutexes"] = mutexes.Run
 	fnMap["statefulgoroutines"] = statefulgoroutines.Run
+	fnMap["sorting"] = sorting.Run
 	return fnMap
 }

sorting/main.go

@@ -0,0 +1,36 @@
+package sorting
+
+import (
+	"fmt"
+	"slices"
+	"sort"
+)
+
+// Go `slices` package implements sorting for
+// builtin types and user defined types.
+func Run() {
+	sortingBuiltIn()
+	sortingCustomType()
+}
+
+// Sorting a builtin type
+func sortingBuiltIn() {
+	strings := []string{"foo", "bar", "baz"}
+	slices.Sort(strings)
+	fmt.Println(strings)
+	// ["bar", "baz", "foo"]
+}
+
+// A custom struct, sortable by an attribute.
+type Foo struct {
+	x int
+}
+
+// Sorting a user defined; custom type
+func sortingCustomType() {
+	foos := []Foo{Foo{x: 3}, Foo{x: 2}, Foo{x: 100}, Foo{x: 1}}
+	sort.Slice(foos[:], func(i, j int) bool {
+		return foos[i].x < foos[j].x
+	})
+	fmt.Println(foos)
+}