OXIESEC PANEL

Name	Size	Modified	Perms
📁 ..	-	02/02/2024 06:09:55 PM	rwxr-xr-x
📄 example_interface_test.go	1.47 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 example_keys_test.go	2.68 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 example_multi_test.go	4.05 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 example_search_test.go	2.12 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 example_test.go	2.85 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 example_wrapper_test.go	1.63 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 export_test.go	314 bytes	02/02/2024 06:09:55 PM	rw-r--r--
📄 gen_sort_variants.go	19.61 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 search.go	5.67 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 search_test.go	6.78 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 slice.go	1.81 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 sort.go	10.14 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 sort_impl_120.go	602 bytes	02/02/2024 06:09:55 PM	rw-r--r--
📄 sort_impl_go121.go	876 bytes	02/02/2024 06:09:55 PM	rw-r--r--
📄 sort_slices_benchmark_test.go	3.92 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 sort_test.go	16.91 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 zsortfunc.go	11.49 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 zsortinterface.go	11.22 KB	02/02/2024 06:09:55 PM	rw-r--r--

Editing: example_keys_test.go

// Copyright 2013 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"
	"sort"
)

// A couple of type definitions to make the units clear.
type earthMass float64
type au float64

// A Planet defines the properties of a solar system object.
type Planet struct {
	name     string
	mass     earthMass
	distance au
}

// By is the type of a "less" function that defines the ordering of its Planet arguments.
type By func(p1, p2 *Planet) bool

// Sort is a method on the function type, By, that sorts the argument slice according to the function.
func (by By) Sort(planets []Planet) {
	ps := &planetSorter{
		planets: planets,
		by:      by, // The Sort method's receiver is the function (closure) that defines the sort order.
	}
	sort.Sort(ps)
}

// planetSorter joins a By function and a slice of Planets to be sorted.
type planetSorter struct {
	planets []Planet
	by      func(p1, p2 *Planet) bool // Closure used in the Less method.
}

// Len is part of sort.Interface.
func (s *planetSorter) Len() int {
	return len(s.planets)
}

// Swap is part of sort.Interface.
func (s *planetSorter) Swap(i, j int) {
	s.planets[i], s.planets[j] = s.planets[j], s.planets[i]
}

// Less is part of sort.Interface. It is implemented by calling the "by" closure in the sorter.
func (s *planetSorter) Less(i, j int) bool {
	return s.by(&s.planets[i], &s.planets[j])
}

var planets = []Planet{
	{"Mercury", 0.055, 0.4},
	{"Venus", 0.815, 0.7},
	{"Earth", 1.0, 1.0},
	{"Mars", 0.107, 1.5},
}

// ExampleSortKeys demonstrates a technique for sorting a struct type using programmable sort criteria.
func Example_sortKeys() {
	// Closures that order the Planet structure.
	name := func(p1, p2 *Planet) bool {
		return p1.name < p2.name
	}
	mass := func(p1, p2 *Planet) bool {
		return p1.mass < p2.mass
	}
	distance := func(p1, p2 *Planet) bool {
		return p1.distance < p2.distance
	}
	decreasingDistance := func(p1, p2 *Planet) bool {
		return distance(p2, p1)
	}

// Sort the planets by the various criteria.
	By(name).Sort(planets)
	fmt.Println("By name:", planets)

By(mass).Sort(planets)
	fmt.Println("By mass:", planets)

By(distance).Sort(planets)
	fmt.Println("By distance:", planets)

By(decreasingDistance).Sort(planets)
	fmt.Println("By decreasing distance:", planets)

// Output: By name: [{Earth 1 1} {Mars 0.107 1.5} {Mercury 0.055 0.4} {Venus 0.815 0.7}]
	// By mass: [{Mercury 0.055 0.4} {Mars 0.107 1.5} {Venus 0.815 0.7} {Earth 1 1}]
	// By distance: [{Mercury 0.055 0.4} {Venus 0.815 0.7} {Earth 1 1} {Mars 0.107 1.5}]
	// By decreasing distance: [{Mars 0.107 1.5} {Earth 1 1} {Venus 0.815 0.7} {Mercury 0.055 0.4}]
}