sort and reverse map by values - golang

sort_reverse_by_values.go

// A slice of pairs that implements sort.Interface to sort and reverse by values
type PairList []Pair

func (p PairList) Len() int           { return len(p) }
func (p PairList) Swap(i, j int)      { p[i], p[j] = p[j], p[i] }
func (p PairList) Less(i, j int) bool { return p[i].Value < p[j].Value }

func sortMapByValues(m map[string]float64) PairList {
	p := make(PairList, len(m))

	i := 0
	for k, v := range m {
		p[i] = Pair{k, v}
		i++
	}

	sort.Sort(p)
	return p
}

func reverseMapByValues(m map[string]float64) PairList {
	p := make(PairList, len(m))

	i := 0
	for k, v := range m {
		p[i] = Pair{k, v}
		i++
	}

	sort.Sort(sort.Reverse(p))
	return p
}