ToString function in Go

Question

The strings Join function takes slices of strings only   s      string  foo    bar    baz   fmt Println strings Join s           But it would be nice to be able to pass arbitrary objects which implement a ToString   function   type ToStringConverter interface       ToString   string     Is there something like this in Go or do I have to decorate existing types like int with ToString methods and write a wrapper around strings Join   func Join a   ToStringConverter  sep string  string

User · Accepted Answer

Attach a String   string method to any named type and enjoy any custom  ToString  functionality   package main  import  fmt   type bin int  func  b bin  String   string           return fmt Sprintf   b   b     func main             fmt Println bin 42       Playground  http   play golang org p Azql7 pDAA    Output  101010

User · Answer

I prefer something like the following   type StringRef   byte  func  s StringRef  String   string           return string s                rather silly example  but     fmt Printf  foo  s n  StringRef  bar

User · Answer

Another example with a struct    package types  import  fmt   type MyType struct       Id   int         Name string    func  t MyType  String   string       return fmt Sprintf         d    s        t Id       t Name      Be careful when using it  concatenation with       doesn t compile    t    types MyType  12   Blabla     fmt Println t     OK fmt Printf  t    s  n   t     OK   fmt Println  t       t     Compiler error     fmt Println  t       t String       OK if calling the function explicitly

User · Answer

When you have own struct  you could have own convert-to-string function   package main  import        fmt     type Color struct       Red   int  json  red       Green int  json  green       Blue  int  json  blue      func  c Color  String   string       return fmt Sprintf    d   d   d    c Red  c Green  c Blue     func main         c    Color Red  123  Green  11  Blue  34      fmt Println c     123  11  34

[go] ToString() function in Go

Examples related to go

Examples related to tostring