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// Copyright 2021 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package foo_test
import (
"flag"
"fmt"
"log"
"os/exec"
"sort"
)
func ExampleHello() {
fmt.Println("Hello, world!")
// Output: Hello, world!
}
func ExampleImport() {
out, err := exec.Command("date").Output()
if err != nil {
log.Fatal(err)
}
fmt.Printf("The date is %s\n", out)
}
func ExampleKeyValue() {
v := struct {
a string
b int
}{
a: "A",
b: 1,
}
fmt.Print(v)
// Output: a: "A", b: 1
}
func ExampleKeyValueImport() {
f := flag.Flag{
Name: "play",
}
fmt.Print(f)
// Output: Name: "play"
}
var keyValueTopDecl = struct {
a string
b int
}{
a: "B",
b: 2,
}
func ExampleKeyValueTopDecl() {
fmt.Print(keyValueTopDecl)
// Output: a: "B", b: 2
}
// Person represents a person by name and age.
type Person struct {
Name string
Age int
}
// String returns a string representation of the Person.
func (p Person) String() string {
return fmt.Sprintf("%s: %d", p.Name, p.Age)
}
// ByAge implements sort.Interface for []Person based on
// the Age field.
type ByAge []Person
// Len returns the number of elements in ByAge.
func (a ByAge) Len() int { return len(a) }
// Swap swaps the elements in ByAge.
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 }
// people is the array of Person
var people = []Person{
{"Bob", 31},
{"John", 42},
{"Michael", 17},
{"Jenny", 26},
}
func ExampleSort() {
fmt.Println(people)
sort.Sort(ByAge(people))
fmt.Println(people)
// Output:
// [Bob: 31 John: 42 Michael: 17 Jenny: 26]
// [Michael: 17 Jenny: 26 Bob: 31 John: 42]
}