78 lines
1.6 KiB
Go
78 lines
1.6 KiB
Go
// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package sort_test
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import (
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"fmt"
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"sort"
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)
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type Grams int
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func (g Grams) String() string { return fmt.Sprintf("%dg", int(g)) }
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type Organ struct {
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Name string
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Weight Grams
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}
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type Organs []*Organ
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func (s Organs) Len() int { return len(s) }
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func (s Organs) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
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// ByName implements sort.Interface by providing Less and using the Len and
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// Swap methods of the embedded Organs value.
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type ByName struct{ Organs }
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func (s ByName) Less(i, j int) bool { return s.Organs[i].Name < s.Organs[j].Name }
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// ByWeight implements sort.Interface by providing Less and using the Len and
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// Swap methods of the embedded Organs value.
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type ByWeight struct{ Organs }
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func (s ByWeight) Less(i, j int) bool { return s.Organs[i].Weight < s.Organs[j].Weight }
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func ExampleInterface() {
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s := []*Organ{
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{"brain", 1340},
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{"heart", 290},
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{"liver", 1494},
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{"pancreas", 131},
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{"prostate", 62},
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{"spleen", 162},
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}
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sort.Sort(ByWeight{s})
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fmt.Println("Organs by weight:")
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printOrgans(s)
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sort.Sort(ByName{s})
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fmt.Println("Organs by name:")
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printOrgans(s)
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// Output:
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// Organs by weight:
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// prostate (62g)
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// pancreas (131g)
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// spleen (162g)
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// heart (290g)
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// brain (1340g)
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// liver (1494g)
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// Organs by name:
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// brain (1340g)
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// heart (290g)
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// liver (1494g)
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// pancreas (131g)
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// prostate (62g)
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// spleen (162g)
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}
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func printOrgans(s []*Organ) {
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for _, o := range s {
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fmt.Printf("%-8s (%v)\n", o.Name, o.Weight)
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}
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}
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