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

Reusing Arguments in fmt.Printf

In Python's print function, you can reuse an argument value by specifying it once and referencing it multiple times using the {} syntax. However, Go's fmt.Printf function does not have a similar mechanism.

Solution

To reuse an argument value in fmt.Printf, you can use the [n] notation to reference arguments explicitly. For example, to print the same value twice using the argument i:

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

In this expression, %[1] refers to the first argument, which is i. By using this approach, you can avoid declaring the argument multiple times and keep your code concise.

Here is an example you can try out:

package main

import "fmt"

func main() {
    i := 10
    fmt.Printf("%[1]d %[1]d\n", i)
}

Output:

10 10

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