Why Does My Go Function Call Result in the 'Used as Value' Error?

"used as value" in Function Call

In Go, functions can be invoked to evaluate their values, which can be used in conditional statements. However, when evaluating function values, it's crucial to ensure proper function declaration and invocation.

In the provided code snippet:

if sumThis(1,2) > sumThis(3,4){
    fmt.Println("test")
} else {
    fmt.Println("derp")
}

The function sumThis is invoked multiple times to calculate its value. However, the error message indicates that sumThis is "used as value," which means the function call is attempting to assign the result of the function call to a variable without specifying a return type.

To resolve this, you need to declare a return type for the sumThis function. In Go, functions must explicitly declare their return types. The function should be declared as follows:

func sumThis(a, b int) int {
    return a + b
}

By specifying the return type as int, the function will return the result of the calculation. Now, the code will compile and run successfully, printing either "test" or "derp" depending on the results of the function calls.

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