How do I change case (upper, lower, title)?

In Go, you can use the strings package to change the case of a string. Here is how you can convert strings to upper case, lower case, and title case:


    package main

    import (
        "fmt"
        "strings"
    )

    func main() {
        str := "hello, world!"

        // Convert to upper case
        upperStr := strings.ToUpper(str)
        fmt.Println(upperStr) // Output: HELLO, WORLD!

        // Convert to lower case
        lowerStr := strings.ToLower(str)
        fmt.Println(lowerStr) // Output: hello, world!

        // Convert to title case
        titleStr := strings.Title(str)
        fmt.Println(titleStr) // Output: Hello, World!
    }