go-recursive's Introduction

Go-recursive - Walk and update nested Go objects

Go-recursive is Golang library to walk through and update nested objects. It goes down structs, maps, slices recursively.

Example

Incrememt Int value inside nested struct:

Define function:

func incrementFunc(obj interface{}, level int) interface{} {
	if i, ok := obj.(int); ok {
		i += +1
		return i
	}

	return obj // return unchanged
}

Define object. Let it be complex object here - nested structs inside map:

type NestedStruct struct {
	Int    int
	Nested *NestedStruct
}

var(
	n = NestedStruct{Int: 20}
	obj = map[int]NestedStruct{
		1: NestedStruct{Int: 10, Nested: &n},
		2: NestedStruct{},
	}
)

Execute:
```
	recursive.Go(&obj, incrementFunc)
```

Check result:

Before:
map[1:{Int:10 Nested:0xc000010230} 2:{Int:0 Nested:<nil>}] (map)
>>>> {Int:0 Nested:<nil>} (struct)
>>>>>>>> 0 (int)
>>>>>>>> <nil> (ptr)
>>>> {Int:10 Nested:0xc000010230} (struct)
>>>>>>>> 10 (int)
>>>>>>>> &{Int:20 Nested:<nil>} (ptr)
>>>>>>>>>>>> {Int:20 Nested:<nil>} (struct)
>>>>>>>>>>>>>>>> 20 (int)
>>>>>>>>>>>>>>>> <nil> (ptr)

After:
map[1:{Int:11 Nested:0xc000010230} 2:{Int:1 Nested:<nil>}] (map)
>>>> {Int:1 Nested:<nil>} (struct)
>>>>>>>> 1 (int)
>>>>>>>> <nil> (ptr)
>>>> {Int:11 Nested:0xc000010230} (struct)
>>>>>>>> 11 (int)
>>>>>>>> &{Int:21 Nested:<nil>} (ptr)
>>>>>>>>>>>> {Int:21 Nested:<nil>} (struct)
>>>>>>>>>>>>>>>> 21 (int)
>>>>>>>>>>>>>>>> <nil> (ptr)

Check examples directory for complete program.

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