simple groupby

gistfile1.go

package main

import "log"


func groupBy(vars []int) map[int][]int {
    result := make(map[int][]int)
    for _, value := range vars {
        result[value] = append(result[value], value)
    }
    return result
}


func main() {
    log.Print(groupBy([]int{1,2,3,4,1,2,3,4}))
}