github.com/tidwall/go@v0.0.0-20170415222209-6694a6888b7d/src/sort/example_test.go (about)

     1  // Copyright 2011 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 sort_test
     6  
     7  import (
     8  	"fmt"
     9  	"sort"
    10  )
    11  
    12  func ExampleInts() {
    13  	s := []int{5, 2, 6, 3, 1, 4} // unsorted
    14  	sort.Ints(s)
    15  	fmt.Println(s)
    16  	// Output: [1 2 3 4 5 6]
    17  }
    18  
    19  func ExampleReverse() {
    20  	s := []int{5, 2, 6, 3, 1, 4} // unsorted
    21  	sort.Sort(sort.Reverse(sort.IntSlice(s)))
    22  	fmt.Println(s)
    23  	// Output: [6 5 4 3 2 1]
    24  }
    25  
    26  func ExampleSlice() {
    27  	people := []struct {
    28  		Name string
    29  		Age  int
    30  	}{
    31  		{"Gopher", 7},
    32  		{"Alice", 55},
    33  		{"Vera", 24},
    34  		{"Bob", 75},
    35  	}
    36  	sort.Slice(people, func(i, j int) bool { return people[i].Name < people[j].Name })
    37  	fmt.Println("By name:", people)
    38  
    39  	sort.Slice(people, func(i, j int) bool { return people[i].Age < people[j].Age })
    40  	fmt.Println("By age:", people)
    41  	// Output: By name: [{Alice 55} {Bob 75} {Gopher 7} {Vera 24}]
    42  	// By age: [{Gopher 7} {Vera 24} {Alice 55} {Bob 75}]
    43  }
    44  
    45  func ExampleSliceStable() {
    46  
    47  	people := []struct {
    48  		Name string
    49  		Age  int
    50  	}{
    51  		{"Alice", 25},
    52  		{"Elizabeth", 75},
    53  		{"Alice", 75},
    54  		{"Bob", 75},
    55  		{"Alice", 75},
    56  		{"Bob", 25},
    57  		{"Colin", 25},
    58  		{"Elizabeth", 25},
    59  	}
    60  
    61  	// Sort by name, preserving original order
    62  	sort.SliceStable(people, func(i, j int) bool { return people[i].Name < people[j].Name })
    63  	fmt.Println("By name:", people)
    64  
    65  	// Sort by age preserving name order
    66  	sort.SliceStable(people, func(i, j int) bool { return people[i].Age < people[j].Age })
    67  	fmt.Println("By age,name:", people)
    68  
    69  	// Output: By name: [{Alice 25} {Alice 75} {Alice 75} {Bob 75} {Bob 25} {Colin 25} {Elizabeth 75} {Elizabeth 25}]
    70  	// By age,name: [{Alice 25} {Bob 25} {Colin 25} {Elizabeth 25} {Alice 75} {Alice 75} {Bob 75} {Elizabeth 75}]
    71  }