How to Handle Extra Fields in fmt.Sprintf?

Handling Extra Fields in fmt.Sprintf

Problem:
When using fmt.Sprintf to format strings, extra fields can cause panic errors. For instance, attempts to format complete strings like "Hello Friends" using a string template like "hello %s" result in errors like "Hello Friends%!(EXTRA string=world)". How do we ignore extra fields in fmt.Sprintf?

Solution:
While there's no direct way to ignore extra fields in fmt.Sprintf, one approach is to enforce a specific verb requirement. In this case, we can require users to always provide a %s verb in their command line arguments. To handle cases with no actual formatting, users can truncate the string to zero length:

<code class="go">Hello Friends%.0s</code>

Or, even shorter:

<code class="go">Hello Friends%.s</code>

This will produce the plain output:

Hello Friends

By adhering to this convention, you can circumvent errors caused by unexpected extra fields in the sprintf format string.

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