Created
April 2, 2022 20:18
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Walk function takes a struct and a function as arguments and calls the function for all string fields found inside the struct. The use of reflection is demonstrated here.
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| package reflection | |
| import "reflect" | |
| func Walk(x interface{}, fn func(input string)) { | |
| val := getValue(x) | |
| walkValue := func(value reflect.Value) { | |
| Walk(value.Interface(), fn) | |
| } | |
| switch val.Kind() { | |
| case reflect.String: | |
| fn(val.String()) | |
| case reflect.Struct: | |
| for i := 0; i < val.NumField(); i++ { | |
| walkValue(val.Field(i)) | |
| } | |
| case reflect.Slice, reflect.Array: | |
| for i := 0; i < val.Len(); i++ { | |
| walkValue(val.Index(i)) | |
| } | |
| case reflect.Map: | |
| for _, key := range val.MapKeys() { | |
| walkValue(val.MapIndex(key)) | |
| } | |
| case reflect.Chan: | |
| for v, ok := val.Recv(); ok; v, ok = val.Recv() { | |
| Walk(v.Interface(), fn) | |
| } | |
| case reflect.Func: | |
| valFnResult := val.Call(nil) | |
| for _, res := range valFnResult { | |
| Walk(res.Interface(), fn) | |
| } | |
| } | |
| } | |
| func getValue(x interface{}) reflect.Value { | |
| val := reflect.ValueOf(x) | |
| if val.Kind() == reflect.Ptr { | |
| val = val.Elem() | |
| } | |
| return val | |
| } |
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