Why Does Go Allow Unused Function Parameters While Other Languages Don't?

Unused Function Parameters in Go

Unlike local variables, Go allows the compiler to build a program even if it contains unused function parameters. This behavior differs from languages like C, where unused variables result in compilation errors.

The reason for this has been a matter of debate. However, as explained in a discussion on golang-nuts, it stems from the belief that:

• Unused variables are inherently programming errors.
• It is common to define functions with unused arguments.

Unused parameters provide essential documentation, aiding comprehension even if they are not explicitly used within the function. For example:

func foo(param_a int, param_b int) int {
    return param_a
}

Even though param_b is unused, its presence conveys the intention of the function. This is especially beneficial in cases like:

func Distance(node1, node2 Node) int {
    return 1
}

Here, Distance operates on a weighted graph with a uniform cost across all edges. While the nodes are not utilized, they are essential for clarifying the function's purpose and serving as documentation.

While some argue that only unused parameters named as underscores (_), should be permitted, this change would conflict with Go's future-compatibility guarantee. Additionally, it is argued that unused parameters, despite not being utilized within the function, can provide valuable documentation.

Ultimately, the decision to allow unused function parameters is a practical one, based on the perceived balance between usefulness and programming errors. The specific rationale may not be documented explicitly, but it is grounded in the practical realities of software development in Go.

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