How to Handle Unexpected String Templates in fmt.Sprintf in Golang?

Handling Unexpected String Templates in fmt.Sprintf

In Golang, fmt.Sprintf is a common function used to format strings. While it offers flexibility, there are scenarios where it can encounter unexpected behavior.

One such scenario is when a program passes a complete string without placeholders to fmt.Sprintf. Consider the following example:

<code class="go">import "fmt"

func main() {
    tmp_str := "hello %s"
    str := fmt.Sprintf(tmp_str, "world")
    fmt.Println(str)
}</code>

If the program receives a complete string like "Hello Friends" instead of a template, it will cause a panic and output an error message.

Preventing the Unexpected

To mitigate this issue, several approaches can be considered:

• Require placeholders: Enforce the use of placeholders (e.g., %s) in string templates. Instruct users to truncate the string to zero length if desired:

Hello Friends%.0s

This will result in a plain output:

Hello Friends

• Use alternative formatting techniques: Consider using alternative formatting techniques that handle non-placeholder strings more gracefully, such as string concatenation ( ) or the strings.Join function.

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