How to Efficiently Append Arguments to a Variadic Function Wrapper in Go?

Efficient Appending to Variadic Function Wrapper

Variadic functions in Go, such as fmt.Println, allow you to pass a variable number of arguments. When using a wrapper function for debugging purposes, however, appending additional arguments can lead to memory allocation issues.

In the provided examples, the first two attempts to extend the fmt.Fprintln function with additional arguments result in errors. The third method involves manually constructing a new slice, which introduces overhead.

To avoid memory reallocation, you can utilize the append function:

<code class="go">func Debug(a ...interface{}) {
    if debug {
        fmt.Fprintln(out, append([]interface{}{prefix, sep}, a...)...)
    }
}</code>

This one-liner takes the existing slice of arguments (a) and extends it with the additional items (prefix and sep) using append. The resulting slice is then passed to fmt.Fprintln, ensuring efficient argument expansion without the need for explicit memory allocation.

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