How Can I Reuse Arguments in Go's fmt.Printf Function?

Reusing Arguments in fmt.Printf

When working with the fmt.Printf function, it's often necessary to reuse arguments. For instance, you may want to print the same value multiple times within the same statement.

The Question

Is there a way to tell fmt.Printf to reuse the same argument, similar to the following:

fmt.Printf("%d %d", i)

The Answer

Absolutely! fmt.Printf provides a way to reuse arguments explicitly using the [n] notation. This allows you to index individual arguments and reuse them as desired.

To reuse the argument i, simply use the following syntax:

fmt.Printf("%[1]d %[1]d\n", i)

In this example, the [1] indicates that we want to reuse the first argument, which is i.

Here's a complete example you can try out:

package main

import "fmt"

func main() {
    i := 10

    // Print i twice using the [1] notation
    fmt.Printf("%[1]d %[1]d\n", i)
}

By utilizing the [n] notation, you can easily reuse arguments in fmt.Printf, providing greater flexibility and control over your output formatting.

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