I have Go program that has a function defined. I also have a map that should have a key for each function. How can I do that?
I have tried this, but this doesn't work.
func a(param string) {
}
m := map[string] func {
'a_func': a,
}
for key, value := range m {
if key == 'a_func' {
value(param)
}
}
I used a map[string]func (a type, b *type) I passed a string to search the map and a pointer to modify the slice.
Hope that helps!
var Exceptions map[string]func(step string, item *structs.Item)
func SetExceptions() {
Exceptions = map[string]func(a string, i *structs.Item){
"step1": step1,
}
}
func RunExceptions(state string, item *structs.Item) {
method, methBool := Exceptions[state]
if methBool {
method(state, item)
}
}
func step1(step string, item *structs.Item) {
item.Title = "Modified"
}
Here is the way I made it work in my case:
package main
import (
"fmt"
)
var routes map[string]func() string
func main() {
routes = map[string]func() string{
"GET /": homePage,
"GET /about": aboutPage,
}
fmt.Println("GET /", pageContent("GET /"))
fmt.Println("GET /about", pageContent("GET /about"))
fmt.Println("GET /unknown", pageContent("GET /unknown"))
// Output:
// GET / Home page
// GET /about About page
// GET /unknown 404: Page Not Found
}
func pageContent(route string) string {
page, ok := routes[route]
if ok {
return page()
} else {
return notFoundPage()
}
}
func homePage() string {
return "Home page"
}
func aboutPage() string {
return "About page"
}
func notFoundPage() string {
return "404: Page Not Found"
}
Hope this works for you(you can use interface{} instead any)
package main
import (
"fmt"
)
func toon(v any) {
fmt.Println(v)
}
func main() {
names := map[string]any{
"Function": toon,
}
names["Function"].(func(any))("a")
}