How Do I Modify Strings in Go, Knowing They Are Immutable?

Altering Strings in Go: A Practical Solution

In Go, strings are immutable, meaning their contents cannot be modified once created. This can be frustrating when attempting to alter an existing string, but there is a simple solution using the fmt package.

Consider the following code:

<code class="go">package main

import "fmt"

func ToUpper(str string) string {
    new_str := str
    for i := 0; i = 'a' && str[i] <p>This code attempts to uppercase lowercase characters in a string, but you will encounter an error: "cannot assign to new_str[i]". This is because strings are immutable.</p>
<p>To overcome this, we can convert the string to a slice of bytes and alter that instead:</p>
<pre class="brush:php;toolbar:false"><code class="go">func ToUpper(str string) string {
    new_str := []byte(str)
    for i := 0; i = 'a' && str[i] <p>Here, []byte(str) creates a byte slice from the string, and string(new_str) converts the modified byte slice back to a string.</p>
<p>With this change, you can now alter strings and covert lowercase characters to uppercase:</p>
<pre class="brush:php;toolbar:false">fmt.Println(ToUpper("cdsrgGDH7865fxgh")) // Output: CDSRGgdh7865FXGH

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