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Source file src/sort/example_test.go

Documentation: sort

  // Copyright 2011 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 sort_test
  
  import (
  	"fmt"
  	"math"
  	"sort"
  )
  
  func ExampleInts() {
  	s := []int{5, 2, 6, 3, 1, 4} // unsorted
  	sort.Ints(s)
  	fmt.Println(s)
  	// Output: [1 2 3 4 5 6]
  }
  
  func ExampleIntsAreSorted() {
  	s := []int{1, 2, 3, 4, 5, 6} // sorted ascending
  	fmt.Println(sort.IntsAreSorted(s))
  
  	s = []int{6, 5, 4, 3, 2, 1} // sorted descending
  	fmt.Println(sort.IntsAreSorted(s))
  
  	s = []int{3, 2, 4, 1, 5} // unsorted
  	fmt.Println(sort.IntsAreSorted(s))
  
  	// Output: true
  	// false
  	// false
  }
  
  func ExampleFloat64s() {
  	s := []float64{5.2, -1.3, 0.7, -3.8, 2.6} // unsorted
  	sort.Float64s(s)
  	fmt.Println(s)
  
  	s = []float64{math.Inf(1), math.NaN(), math.Inf(-1), 0.0} // unsorted
  	sort.Float64s(s)
  	fmt.Println(s)
  
  	// Output: [-3.8 -1.3 0.7 2.6 5.2]
  	// [NaN -Inf 0 +Inf]
  }
  
  func ExampleFloat64sAreSorted() {
  	s := []float64{0.7, 1.3, 2.6, 3.8, 5.2} // sorted ascending
  	fmt.Println(sort.Float64sAreSorted(s))
  
  	s = []float64{5.2, 3.8, 2.6, 1.3, 0.7} // sorted descending
  	fmt.Println(sort.Float64sAreSorted(s))
  
  	s = []float64{5.2, 1.3, 0.7, 3.8, 2.6} // unsorted
  	fmt.Println(sort.Float64sAreSorted(s))
  
  	// Output: true
  	// false
  	// false
  }
  
  func ExampleReverse() {
  	s := []int{5, 2, 6, 3, 1, 4} // unsorted
  	sort.Sort(sort.Reverse(sort.IntSlice(s)))
  	fmt.Println(s)
  	// Output: [6 5 4 3 2 1]
  }
  
  func ExampleSlice() {
  	people := []struct {
  		Name string
  		Age  int
  	}{
  		{"Gopher", 7},
  		{"Alice", 55},
  		{"Vera", 24},
  		{"Bob", 75},
  	}
  	sort.Slice(people, func(i, j int) bool { return people[i].Name < people[j].Name })
  	fmt.Println("By name:", people)
  
  	sort.Slice(people, func(i, j int) bool { return people[i].Age < people[j].Age })
  	fmt.Println("By age:", people)
  	// Output: By name: [{Alice 55} {Bob 75} {Gopher 7} {Vera 24}]
  	// By age: [{Gopher 7} {Vera 24} {Alice 55} {Bob 75}]
  }
  
  func ExampleSliceStable() {
  
  	people := []struct {
  		Name string
  		Age  int
  	}{
  		{"Alice", 25},
  		{"Elizabeth", 75},
  		{"Alice", 75},
  		{"Bob", 75},
  		{"Alice", 75},
  		{"Bob", 25},
  		{"Colin", 25},
  		{"Elizabeth", 25},
  	}
  
  	// Sort by name, preserving original order
  	sort.SliceStable(people, func(i, j int) bool { return people[i].Name < people[j].Name })
  	fmt.Println("By name:", people)
  
  	// Sort by age preserving name order
  	sort.SliceStable(people, func(i, j int) bool { return people[i].Age < people[j].Age })
  	fmt.Println("By age,name:", people)
  
  	// Output: By name: [{Alice 25} {Alice 75} {Alice 75} {Bob 75} {Bob 25} {Colin 25} {Elizabeth 75} {Elizabeth 25}]
  	// By age,name: [{Alice 25} {Bob 25} {Colin 25} {Elizabeth 25} {Alice 75} {Alice 75} {Bob 75} {Elizabeth 75}]
  }
  
  func ExampleStrings() {
  	s := []string{"Go", "Bravo", "Gopher", "Alpha", "Grin", "Delta"}
  	sort.Strings(s)
  	fmt.Println(s)
  	// Output: [Alpha Bravo Delta Go Gopher Grin]
  }
  

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