How Can I Customize String Joining in Go for Objects Beyond String Slices?

Custom ToString Functionality for Strings.Join in Go

In Go, the strings.Join function requires a slice of strings as input. However, it can be useful to join objects of different types that support converting to strings.

Problem:

We want to create a custom function, Join, that takes a slice of objects implementing a ToString() function and joins their string representations with a specified separator.

Solution:

Instead of defining a specific ToString() interface, we can utilize Go's built-in String() method. Simply attach this method to any named type, and you'll automatically gain the ability to customize the string representation.

Example:

Here's an example of creating a custom type (bin) that extends the standard int type:

package main

import "fmt"

type bin int

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

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

Output:

101010

In this example, the binary representation of the integer 42 is printed to the console. Note that we can directly call fmt.Println on the bin type because it now has a String() method attached.

By using the String() method, we avoid the need for a custom ToString() interface or wrapper functions. It allows us to easily extend existing types and customize their string representations for various use cases.

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