Sorting a Map by its Values
Given a map of strings to integers, it is desirable to sort the map by its values in descending order.
Solution:
Implementing a custom sorting interface can achieve this functionality. The following code provides all the necessary functions to sort a map by its values:
func rankByWordCount(wordFrequencies map[string]int) PairList {
pl := make(PairList, len(wordFrequencies))
i := 0
for k, v := range wordFrequencies {
pl[i] = Pair{k, v}
i++
}
sort.Sort(sort.Reverse(pl))
return pl
}
type Pair struct {
Key string
Value int
}
type PairList []Pair
func (p PairList) Len() int { return len(p) }
func (p PairList) Less(i, j int) bool { return p[i].Value < p[j].Value }
func (p PairList) Swap(i, j int){ p[i], p[j] = p[j], p[i] }For example, using the given map:
m := map[string]int{"hello": 10, "foo": 20, "bar": 20}The sorted output would be:
foo, 20 bar, 20 hello, 10
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