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01_sort_map.go
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/
01_sort_map.go
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package main
import (
"fmt"
"sort"
)
type keyValue struct {
key string
value float64
}
type keyValueSlice []keyValue
func (p keyValueSlice) Swap(i, j int) { p[i], p[j] = p[j], p[i] }
func (p keyValueSlice) Len() int { return len(p) }
func (p keyValueSlice) Less(i, j int) bool {
return p[i].value < p[j].value
}
func sortMapByValue(m map[string]float64) keyValueSlice {
p := make(keyValueSlice, len(m))
i := 0
for k, v := range m {
p[i] = keyValue{k, v}
i++
}
sort.Sort(p)
return p
}
func main() {
sfmap := map[string]float64{
"California": 9.9,
"Japan": 7.23,
"Korea": -.3,
"Hello": 1.5,
"USA": 8.4,
"San Francisco": 8.4,
"Ohio": -1.10,
"New York": 1.23,
"Los Angeles": 23.1,
"Mountain View": 9.9,
}
fmt.Println(sortMapByValue(sfmap), len(sortMapByValue(sfmap)))
// [{Ohio -1.1} {Korea -0.3} {New York 1.23} {Hello 1.5}
// {Japan 7.23} {USA 8.4} {San Francisco 8.4} {California 9.9}
// {Mountain View 9.9} {Los Angeles 23.1}] 10
}