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sets.go
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sets.go
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// From
// http://programmers.stackexchange.com/questions/177428/sets-data-structure-in-golang
// http://play.golang.org/p/_FvECoFvhq
// https://groups.google.com/forum/#!topic/golang-nuts/lb4xLHq7wug
// https://github.com/deckarep/golang-set/blob/master/
// Use like:
// set := NewIntSet()
// set.Add(1)
// set.Add(2)
// set.Add(3)
// fmt.Println(set.Get(2))
// set.Remove(2)
// fmt.Println(set.Get(2))
package goutils
import (
"sort"
"strings"
)
// StringSet is the struct containing the set built as map[string]bool
type StringSet map[string]bool
// NewStringSet creates a new set
// Remember that a map is already a pointer.
func NewStringSet() StringSet {
return make(StringSet)
}
// NewStringSet creates a new set
func NewStringSetFromSlice(ss []string) StringSet {
set := NewStringSet()
for _, item := range ss {
set.Add(item)
}
return set
}
// Add add a new intem to the set if it doesn't exist
func (set StringSet) Add(item string) bool {
var exists bool
if _, exists = set[item]; !exists {
set[item] = true
}
return !exists //False if it existed already
}
// Get return the element if it exists
func (set StringSet) Get(item string) bool {
var exists bool
_, exists = set[item]
return exists //true if it existed already
}
// Remove removes an item form the set if it exists
func (set StringSet) Remove(item string) {
delete(set, item)
}
// Return a sorted slice of string containing the set elements.
func (set StringSet) Sorted() []string {
temp := make([]string, 0)
for key, _ := range set {
temp = append(temp, key)
}
sort.Strings(temp)
return temp
}
// Provides a convenient string representation of the current state of the set.
func (set StringSet) String() string {
return strings.Join(set.Sorted(), ", ")
}