How Can I Replace All Variables in fmt.Sprintf() with the Same Value?

Replace Individual Variables in Sprintf with Same Value

In fmt.Sprintf(), argument indexes can be specified explicitly using the notation [n], allowing different variables to be replaced at different positions in the formatted string. However, using this approach to replace all variables with the same value requires a slight modification to the format string.

Solution:

Instead of relying on successive arguments, use bracketed argument indexes before each formatting verb to indicate that the same argument should be used:

val := "foo"
s := fmt.Sprintf("%[1]v in %[1]v is %[1]v", val)

This format string specifies that argument index 1 should be used for all three formatting verbs, resulting in:

"foo in foo is foo"

Simplified Options:

The first explicit argument index can be omitted, as it defaults to 1:

fmt.Printf("%v in %[1]v is %[1]v", "foo")

Additionally, the brackets and argument index can be combined into a single string:

fmt.Printf("%v in %1v is %1v", "foo")

Conclusion:

By using explicit argument indexes, it is possible to replace all variables in fmt.Sprintf() with the same value, providing greater flexibility in formatting strings.

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