Golang like with non if-else

package main

import "fmt"

func formatLessThan4(nameList []string) interface{} {
    format := map[int]interface{}{
        0: func(nameList []string) {
            fmt.Printf("no one likes this")
        },
        1: func(nameList []string) {
            fmt.Printf("%s likes this", nameList[0])
        },
        2: func(nameList []string) {
            fmt.Printf("%s and %s like this", nameList[0], nameList[1])
        },
        3: func(nameList []string) {
            fmt.Printf("%s, %s and %s like this", nameList[0], nameList[1], nameList[2])
        },
    }
    return func() {
        format[len(nameList)].(func([]string))(nameList)
    }
}

func fb(nameList []string) interface{} {
    formatFunc := map[bool]interface{}{
        true: formatLessThan4(nameList),
        false: func() {
            fmt.Printf("%s, %s and %d others like this", nameList[0], nameList[1], len(nameList)-2)
        },
    }
    return formatFunc[len(nameList) < 4]
}
func main() {
    like := []string{"Peter"}
    fb(like).(func())()
}