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gorefactoringprintln

Unexpected output in fmt.Println() function

I'm starting with golang (total noob), and I'm using a simple wrapper function for fmt.Println(str), just because it's shorter and I'm more used to it:

func echo(str ...interface{}) {
  fmt.Println(str)
}

The thing is that the output for echo("Hello") is [Hello] instead of Hello.

Am I missing some syntax detail here? How can I change the function to work as expected?

Besides the actual need for this function, I'm interested in the language-specific details about this issue.

Thanks!

Solution

  • The problem is that you send to fmt.Println parameter as a slice, but not as varadic.

    Change your method to :

    func echo(str ...interface{}) {
    fmt.Println(str...)
}

    And it will work as you expect.

    Check topic Arguments to variadic functions from this site.