creasty / Defaults
Licence: mit
Initialize structs with default values
Stars: ✭ 290
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defaults
Initialize structs with default values
- Supports almost all kind of types
- Scalar types
-
int/8/16/32/64
,uint/8/16/32/64
,float32/64
-
uintptr
,bool
,string
-
- Complex types
-
map
,slice
,struct
-
- Aliased types
time.Duration
- e.g.,
type Enum string
- Pointer types
- e.g.,
*SampleStruct
,*int
- e.g.,
- Scalar types
- Recursively initializes fields in a struct
- Dynamically sets default values by
defaults.Setter
interface - Preserves non-initial values from being reset with a default value
Usage
type Gender string
type Sample struct {
Name string `default:"John Smith"`
Age int `default:"27"`
Gender Gender `default:"m"`
Slice []string `default:"[]"`
SliceByJSON []int `default:"[1, 2, 3]"` // Supports JSON
Map map[string]int `default:"{}"`
MapByJSON map[string]int `default:"{\"foo\": 123}"`
Struct OtherStruct `default:"{}"`
StructPtr *OtherStruct `default:"{\"Foo\": 123}"`
NoTag OtherStruct // Recurses into a nested struct by default
OptOut OtherStruct `default:"-"` // Opt-out
}
type OtherStruct struct {
Hello string `default:"world"` // Tags in a nested struct also work
Foo int `default:"-"`
Random int `default:"-"`
}
// SetDefaults implements defaults.Setter interface
func (s *OtherStruct) SetDefaults() {
if defaults.CanUpdate(s.Random) { // Check if it's a zero value (recommended)
s.Random = rand.Int() // Set a dynamic value
}
}
obj := &Sample{}
if err := defaults.Set(obj); err != nil {
panic(err)
}
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