multiple.go

     1  // Copyright 2021 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package foo_test
     6  
     7  import (
     8  	"flag"
     9  	"fmt"
    10  	"log"
    11  	"os/exec"
    12  	"sort"
    13  )
    14  
    15  func ExampleHello() {
    16  	fmt.Println("Hello, world!")
    17  	// Output: Hello, world!
    18  }
    19  
    20  func ExampleImport() {
    21  	out, err := exec.Command("date").Output()
    22  	if err != nil {
    23  		log.Fatal(err)
    24  	}
    25  	fmt.Printf("The date is %s\n", out)
    26  }
    27  
    28  func ExampleKeyValue() {
    29  	v := struct {
    30  		a string
    31  		b int
    32  	}{
    33  		a: "A",
    34  		b: 1,
    35  	}
    36  	fmt.Print(v)
    37  	// Output: a: "A", b: 1
    38  }
    39  
    40  func ExampleKeyValueImport() {
    41  	f := flag.Flag{
    42  		Name: "play",
    43  	}
    44  	fmt.Print(f)
    45  	// Output: Name: "play"
    46  }
    47  
    48  var keyValueTopDecl = struct {
    49  	a string
    50  	b int
    51  }{
    52  	a: "B",
    53  	b: 2,
    54  }
    55  
    56  func ExampleKeyValueTopDecl() {
    57  	fmt.Print(keyValueTopDecl)
    58  	// Output: a: "B", b: 2
    59  }
    60  
    61  // Person represents a person by name and age.
    62  type Person struct {
    63  	Name string
    64  	Age  int
    65  }
    66  
    67  // String returns a string representation of the Person.
    68  func (p Person) String() string {
    69  	return fmt.Sprintf("%s: %d", p.Name, p.Age)
    70  }
    71  
    72  // ByAge implements sort.Interface for []Person based on
    73  // the Age field.
    74  type ByAge []Person
    75  
    76  // Len returns the number of elements in ByAge.
    77  func (a ByAge) Len() int { return len(a) }
    78  
    79  // Swap swaps the elements in ByAge.
    80  func (a ByAge) Swap(i, j int)      { a[i], a[j] = a[j], a[i] }
    81  func (a ByAge) Less(i, j int) bool { return a[i].Age < a[j].Age }
    82  
    83  // people is the array of Person
    84  var people = []Person{
    85  	{"Bob", 31},
    86  	{"John", 42},
    87  	{"Michael", 17},
    88  	{"Jenny", 26},
    89  }
    90  
    91  func ExampleSort() {
    92  	fmt.Println(people)
    93  	sort.Sort(ByAge(people))
    94  	fmt.Println(people)
    95  	// Output:
    96  	// [Bob: 31 John: 42 Michael: 17 Jenny: 26]
    97  	// [Michael: 17 Jenny: 26 Bob: 31 John: 42]
    98  }
    99
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