How Can I Implement Custom ToString() Functionality for Non-String Objects in Go?

Custom ToString() Functionality in Go

The Go language provides the strings.Join function for concatenating string slices, but what if you want to join arbitrary objects with custom string representations? This question arises when you need to pass non-string objects that don't natively implement the ToString() method.

Custom ToString() Interface

To address this issue, a custom ToStringConverter interface can be created:

type ToStringConverter interface {
    ToString() string
}

Any object that implements this interface can then be passed to a modified Join function:

func Join(a []ToStringConverter, sep string) string

Implementing ToString()

To enable custom string representations, simply implement the String() method for any named type:

package main

import "fmt"

type bin int

func (b bin) String() string {
        return fmt.Sprintf("%b", b)
}

func main() {
        fmt.Println(bin(42))
}

Playground and Output

Playground link: [http://play.golang.org/p/Azql7_pDAA](http://play.golang.org/p/Azql7_pDAA)

Output:

101010

This approach allows for greater flexibility in string concatenation, enabling you to incorporate non-string objects with customized string representations.

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