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package main | |
import ( | |
"fmt" | |
) | |
func GetStructField(f interface{},path []string) interface{} { | |
rangeOver := f.( map[string]interface{}) | |
counter := 0 | |
maxLen := len(path)-1 | |
NESTED: //GOTO *Tail Recursion* more performant by reusing the stack frame | |
for key, value := range rangeOver { | |
if key == path[counter] { | |
next,ok := value.( map[string]interface{} ) | |
if ok { | |
rangeOver = next | |
counter += 1 | |
goto NESTED | |
} else { | |
if key == path[maxLen] { | |
return value | |
} | |
} | |
} | |
} | |
return nil //Key doesnt point to a value but to a map | |
} | |
func main() { | |
var m = map[string]interface{}{ | |
"path": map[string]interface{}{ | |
"test" : "hello", | |
"to": map[string]interface{}{ | |
"variable": 1, | |
"some": map[string]interface{}{ | |
"stuff": ":)", | |
}, | |
}, | |
}, | |
} | |
value := GetStructField(m, []string{"path", "to", "some","stuff"} ) | |
value2 := GetStructField(m, []string{"path", "to", "variable"} ) | |
value3 := GetStructField(m, []string{"path", "test"} ) | |
fmt.Printf("%v %v %v", value, value2,value3) | |
} |
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