How to Pass Multiple Go Function Return Values to a Variadic Function?

How to Pass Multiple Return Values to a Variadic Function in Go?

Background:
Go functions can return multiple values, but standard variadic function calls do not allow for passing those values directly. This article explores a method to achieve this using a custom wrapper function.

Problem:
Consider a function that returns two integer values:

func temp() (int, int) {
    return 1, 1
}

We want to pass these return values to the variadic Printf function to print them using string formatting:

fmt.Printf("first= %d and second = %d", temp()) // Error

Solution:

1. Direct Approach (Not Supported):
The standard function call syntax does not support passing multiple return values to a variadic function. This is because variadic parameters must be the last parameters in a function signature.

2. Wrap Return Values:
We can create a wrapper function that converts the return values of any function into a []interface{} slice. The variadic Printf function can then accept this slice as its arguments.

func wrap(vs ...interface{}) []interface{} {
    return vs
}

Usage:
Using the wrap function, we can now pass the return values of our temp function to Printf:

fmt.Printf("first= %d and second = %d", wrap(temp()...)...)

Additional Notes:

• This technique can be used to pass multiple return values to any variadic function in Go.
• The fmt.Println function can also be used to print multiple return values directly, but it does not support string formatting.

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