Can Multiple Return Values Be Passed as Arguments to Functions with Different Parameter Counts in Go?

Multiple Return Values as Function Arguments in Go

In Go, functions can return multiple values, which can be beneficial for structuring and reusing code. However, when it comes to passing these return values as arguments to another function, certain restrictions apply.

Limitations with Multiple Return Values

If you have a function returnIntAndString() that returns two values (an integer and a string), you can call another function doSomething(int, string) using the return values without any issues, like:

<code class="go">doSomething(returnIntAndString())</code>

However, if you add an additional argument to doSomething(), such as a message string, Go will complain if you call it like this:

<code class="go">doSomething("message", returnIntAndString())</code>

The compilation error:

• main.go:45: multiple-value returnIntAndString() in single-value context
• main.go:45: not enough arguments in call to doSomething()

Workaround

The Go specification does not allow multiple return values to be passed as arguments to functions with additional parameters. The inner function must return the exact number of values required for the outer function's parameters. If this condition is not met, you need to assign the return values to variables and call the function separately, like:

<code class="go">code, str := returnIntAndString()
doSomething("message", code, str)</code>

In conclusion, while multiple return values in Go can enhance code reusability, there are limitations when passing them as arguments to other functions with different parameter counts. When this occurs, manual assignment and separate function invocation are necessary.

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