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How to return instance of struct, idiomatic way
How to define a function type which accepts any number of arguments in Go?How do I convert a go method to a func?Stack vs heap allocation of structs in Go, and how they relate to garbage collectionType converting slices of interfaces in GoWhat is an idiomatic way of representing enums in Go?Removing fields from struct or hiding them in JSON ResponsePointers vs. values in parameters and return valuesWrite struct to csv fileGolang: loop through fields of a struct modify them and and return the struct?Go function types that return structs being used with interfaces
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I've got function that returns struct instance depending on argument it takes
func Factory(s string) interface
if s == 'SomeType'
return SomeType
else if s == 'AnotherType'
return AnotherType
this solution is good if I have a couple of structs to return but it's getting ugly if there are a lot of them, can I do it other way? Is there idiomatic way to do this?
go
edited Mar 22 at 21:56
Flimzy
41.1k1367102
asked Mar 22 at 19:13
latshalatsha
6551719
add a comment |
I've got function that returns struct instance depending on argument it takes
func Factory(s string) interface
if s == 'SomeType'
return SomeType
else if s == 'AnotherType'
return AnotherType
this solution is good if I have a couple of structs to return but it's getting ugly if there are a lot of them, can I do it other way? Is there idiomatic way to do this?
go
edited Mar 22 at 21:56
Flimzy
41.1k1367102
asked Mar 22 at 19:13
latshalatsha
6551719
1
You can use a map to map the string to what you want to return. Or if it's more complicated than returning an empty struct, the map can map the string to a function that produces the value.
– Andy Schweig
Mar 22 at 19:37
I didn’t down vote. It’s not uncommon for someone to just give guidance as opposed to giving a full solution.
– Andy Schweig
Mar 22 at 22:30
@AndySchweig I'm very sorry for that comment but sometimes I didn't understand why here people downvoting I can't find any logic in their behavior. I think mapping to function is what I'm searching for.
– latsha
Mar 23 at 13:54
add a comment |
I've got function that returns struct instance depending on argument it takes
func Factory(s string) interface
if s == 'SomeType'
return SomeType
else if s == 'AnotherType'
return AnotherType
this solution is good if I have a couple of structs to return but it's getting ugly if there are a lot of them, can I do it other way? Is there idiomatic way to do this?
go
edited Mar 22 at 21:56
Flimzy
41.1k1367102
asked Mar 22 at 19:13
latshalatsha
6551719
I've got function that returns struct instance depending on argument it takes
func Factory(s string) interface
if s == 'SomeType'
return SomeType
else if s == 'AnotherType'
return AnotherType
this solution is good if I have a couple of structs to return but it's getting ugly if there are a lot of them, can I do it other way? Is there idiomatic way to do this?
go
go
edited Mar 22 at 21:56
Flimzy
41.1k1367102
asked Mar 22 at 19:13
latshalatsha
6551719
edited Mar 22 at 21:56
Flimzy
41.1k1367102
asked Mar 22 at 19:13
latshalatsha
6551719
edited Mar 22 at 21:56
Flimzy
41.1k1367102
edited Mar 22 at 21:56
Flimzy
41.1k1367102
edited Mar 22 at 21:56
Flimzy
41.1k1367102
41.1k1367102
asked Mar 22 at 19:13
latshalatsha
6551719
asked Mar 22 at 19:13
latshalatsha
6551719
asked Mar 22 at 19:13
latshalatsha
6551719
6551719
1
You can use a map to map the string to what you want to return. Or if it's more complicated than returning an empty struct, the map can map the string to a function that produces the value.
– Andy Schweig
Mar 22 at 19:37
I didn’t down vote. It’s not uncommon for someone to just give guidance as opposed to giving a full solution.
– Andy Schweig
Mar 22 at 22:30
@AndySchweig I'm very sorry for that comment but sometimes I didn't understand why here people downvoting I can't find any logic in their behavior. I think mapping to function is what I'm searching for.
– latsha
Mar 23 at 13:54
add a comment |
1
You can use a map to map the string to what you want to return. Or if it's more complicated than returning an empty struct, the map can map the string to a function that produces the value.
– Andy Schweig
Mar 22 at 19:37
I didn’t down vote. It’s not uncommon for someone to just give guidance as opposed to giving a full solution.
– Andy Schweig
Mar 22 at 22:30
@AndySchweig I'm very sorry for that comment but sometimes I didn't understand why here people downvoting I can't find any logic in their behavior. I think mapping to function is what I'm searching for.
– latsha
Mar 23 at 13:54
1
1
You can use a map to map the string to what you want to return. Or if it's more complicated than returning an empty struct, the map can map the string to a function that produces the value.
– Andy Schweig
Mar 22 at 19:37
You can use a map to map the string to what you want to return. Or if it's more complicated than returning an empty struct, the map can map the string to a function that produces the value.
– Andy Schweig
Mar 22 at 19:37
I didn’t down vote. It’s not uncommon for someone to just give guidance as opposed to giving a full solution.
– Andy Schweig
Mar 22 at 22:30
I didn’t down vote. It’s not uncommon for someone to just give guidance as opposed to giving a full solution.
– Andy Schweig
Mar 22 at 22:30
@AndySchweig I'm very sorry for that comment but sometimes I didn't understand why here people downvoting I can't find any logic in their behavior. I think mapping to function is what I'm searching for.
– latsha
Mar 23 at 13:54
@AndySchweig I'm very sorry for that comment but sometimes I didn't understand why here people downvoting I can't find any logic in their behavior. I think mapping to function is what I'm searching for.
– latsha
Mar 23 at 13:54
add a comment |
1 Answer
1
active
oldest
votes
As the comment said, you can use a map for your types. Looks like this. The factory function will return an instance if the type exists or nil if it doesn't.
package main
import (
"fmt"
"reflect"
)
type SomeType struct Something string
type AnotherType struct
type YetAnotherType struct
var typemap = map[string]interface
"SomeType": SomeType Something: "something" ,
"AnotherType": AnotherType,
"YetAnotherType": YetAnotherType,
func factory(s string) interface
t, ok := typemap[s]
if ok
return reflect.ValueOf(t)
return nil
func main()
fmt.Printf("%#vn", factory("SomeType"))
fmt.Printf("%#vn", factory("NoType"))
Playground link
answered Mar 22 at 19:49
Mad WombatMad Wombat
6,98244071
Thanks for the answer @mad-wombat but isn't it returning the same instance every time I'm callingfactory?
– latsha
Mar 22 at 19:56
Yes, it would. Sorry. You can use reflect to create a new value every time. Updated the code and link
– Mad Wombat
Mar 22 at 20:08
Actually, updated again, looks like using ValueOf() instead of New() provides a bit more flexibility. You can do initialization in your map and it will be preserved.
– Mad Wombat
Mar 22 at 20:12
looks promising will try it tomorrow.
– latsha
Mar 22 at 20:13
add a comment |
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1 Answer
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active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
As the comment said, you can use a map for your types. Looks like this. The factory function will return an instance if the type exists or nil if it doesn't.
package main
import (
"fmt"
"reflect"
)
type SomeType struct Something string
type AnotherType struct
type YetAnotherType struct
var typemap = map[string]interface
"SomeType": SomeType Something: "something" ,
"AnotherType": AnotherType,
"YetAnotherType": YetAnotherType,
func factory(s string) interface
t, ok := typemap[s]
if ok
return reflect.ValueOf(t)
return nil
func main()
fmt.Printf("%#vn", factory("SomeType"))
fmt.Printf("%#vn", factory("NoType"))
Playground link
answered Mar 22 at 19:49
Mad WombatMad Wombat
6,98244071
Thanks for the answer @mad-wombat but isn't it returning the same instance every time I'm callingfactory?
– latsha
Mar 22 at 19:56
Yes, it would. Sorry. You can use reflect to create a new value every time. Updated the code and link
– Mad Wombat
Mar 22 at 20:08
Actually, updated again, looks like using ValueOf() instead of New() provides a bit more flexibility. You can do initialization in your map and it will be preserved.
– Mad Wombat
Mar 22 at 20:12
looks promising will try it tomorrow.
– latsha
Mar 22 at 20:13
add a comment |
As the comment said, you can use a map for your types. Looks like this. The factory function will return an instance if the type exists or nil if it doesn't.
package main
import (
"fmt"
"reflect"
)
type SomeType struct Something string
type AnotherType struct
type YetAnotherType struct
var typemap = map[string]interface
"SomeType": SomeType Something: "something" ,
"AnotherType": AnotherType,
"YetAnotherType": YetAnotherType,
func factory(s string) interface
t, ok := typemap[s]
if ok
return reflect.ValueOf(t)
return nil
func main()
fmt.Printf("%#vn", factory("SomeType"))
fmt.Printf("%#vn", factory("NoType"))
Playground link
answered Mar 22 at 19:49
Mad WombatMad Wombat
6,98244071
Thanks for the answer @mad-wombat but isn't it returning the same instance every time I'm callingfactory?
– latsha
Mar 22 at 19:56
Yes, it would. Sorry. You can use reflect to create a new value every time. Updated the code and link
– Mad Wombat
Mar 22 at 20:08
Actually, updated again, looks like using ValueOf() instead of New() provides a bit more flexibility. You can do initialization in your map and it will be preserved.
– Mad Wombat
Mar 22 at 20:12
looks promising will try it tomorrow.
– latsha
Mar 22 at 20:13
add a comment |
As the comment said, you can use a map for your types. Looks like this. The factory function will return an instance if the type exists or nil if it doesn't.
package main
import (
"fmt"
"reflect"
)
type SomeType struct Something string
type AnotherType struct
type YetAnotherType struct
var typemap = map[string]interface
"SomeType": SomeType Something: "something" ,
"AnotherType": AnotherType,
"YetAnotherType": YetAnotherType,
func factory(s string) interface
t, ok := typemap[s]
if ok
return reflect.ValueOf(t)
return nil
func main()
fmt.Printf("%#vn", factory("SomeType"))
fmt.Printf("%#vn", factory("NoType"))
Playground link
answered Mar 22 at 19:49
Mad WombatMad Wombat
6,98244071
As the comment said, you can use a map for your types. Looks like this. The factory function will return an instance if the type exists or nil if it doesn't.
package main
import (
"fmt"
"reflect"
)
type SomeType struct Something string
type AnotherType struct
type YetAnotherType struct
var typemap = map[string]interface
"SomeType": SomeType Something: "something" ,
"AnotherType": AnotherType,
"YetAnotherType": YetAnotherType,
func factory(s string) interface
t, ok := typemap[s]
if ok
return reflect.ValueOf(t)
return nil
func main()
fmt.Printf("%#vn", factory("SomeType"))
fmt.Printf("%#vn", factory("NoType"))
Playground link
answered Mar 22 at 19:49
Mad WombatMad Wombat
6,98244071
edited Mar 22 at 20:08
answered Mar 22 at 19:49
Mad WombatMad Wombat
6,98244071
answered Mar 22 at 19:49
Mad WombatMad Wombat
6,98244071
answered Mar 22 at 19:49
Mad WombatMad Wombat
6,98244071
6,98244071
Thanks for the answer @mad-wombat but isn't it returning the same instance every time I'm callingfactory?
– latsha
Mar 22 at 19:56
Yes, it would. Sorry. You can use reflect to create a new value every time. Updated the code and link
– Mad Wombat
Mar 22 at 20:08
Actually, updated again, looks like using ValueOf() instead of New() provides a bit more flexibility. You can do initialization in your map and it will be preserved.
– Mad Wombat
Mar 22 at 20:12
looks promising will try it tomorrow.
– latsha
Mar 22 at 20:13
add a comment |
Thanks for the answer @mad-wombat but isn't it returning the same instance every time I'm callingfactory?
– latsha
Mar 22 at 19:56
Yes, it would. Sorry. You can use reflect to create a new value every time. Updated the code and link
– Mad Wombat
Mar 22 at 20:08
Actually, updated again, looks like using ValueOf() instead of New() provides a bit more flexibility. You can do initialization in your map and it will be preserved.
– Mad Wombat
Mar 22 at 20:12
looks promising will try it tomorrow.
– latsha
Mar 22 at 20:13
Thanks for the answer @mad-wombat but isn't it returning the same instance every time I'm calling
factory?– latsha
Mar 22 at 19:56
Thanks for the answer @mad-wombat but isn't it returning the same instance every time I'm calling
factory?– latsha
Mar 22 at 19:56
Yes, it would. Sorry. You can use reflect to create a new value every time. Updated the code and link
– Mad Wombat
Mar 22 at 20:08
Yes, it would. Sorry. You can use reflect to create a new value every time. Updated the code and link
– Mad Wombat
Mar 22 at 20:08
Actually, updated again, looks like using ValueOf() instead of New() provides a bit more flexibility. You can do initialization in your map and it will be preserved.
– Mad Wombat
Mar 22 at 20:12
Actually, updated again, looks like using ValueOf() instead of New() provides a bit more flexibility. You can do initialization in your map and it will be preserved.
– Mad Wombat
Mar 22 at 20:12
looks promising will try it tomorrow.
– latsha
Mar 22 at 20:13
looks promising will try it tomorrow.
– latsha
Mar 22 at 20:13
add a comment |
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1
You can use a map to map the string to what you want to return. Or if it's more complicated than returning an empty struct, the map can map the string to a function that produces the value.
– Andy Schweig
Mar 22 at 19:37
I didn’t down vote. It’s not uncommon for someone to just give guidance as opposed to giving a full solution.
– Andy Schweig
Mar 22 at 22:30
@AndySchweig I'm very sorry for that comment but sometimes I didn't understand why here people downvoting I can't find any logic in their behavior. I think mapping to function is what I'm searching for.
– latsha
Mar 23 at 13:54