What happens if you add strings in Go?

In Go, string addition (+) results in concatenation. This means that the second string is added to the end of the first, creating a new string.

Example:

package main

import "fmt"

func main() {
	str1 := "Hello, "
	str2 := "world!"
	result := str1 + str2 // Concatenation occurs
	fmt.Println(result)
}

Output:

Hello, world!

Concatenation creates a new string. If you need to efficiently concatenate a large number of strings, it is recommended to use strings.Builder, which avoids creating intermediate strings.

Example with strings.Builder:

package main

import (
	"fmt"
	"strings"
)

func main() {
	var sb strings.Builder // Declare strings.Builder
	sb.WriteString("First part. ")
	sb.WriteString("Second part. ")
	sb.WriteString("Third part.")
	result := sb.String() // Get the final string
	fmt.Println(result)
}