Why Name a Function's Return Parameters?

Naming return parameters can provide numerous benefits that can enhance code readability, flexibility, and documentation.

Benefits of Naming Return Parameters:

• Documentation: Return parameter names serve as additional documentation, explicitly indicating the purpose and type of each return value. This improves code understanding and reduces the need for external comments.
• Auto-Declaration and Initialization: Named return parameters are automatically declared and initialized to their zero values upon function invocation. This eliminates the need for explicit variable declarations within the function body.
• Simplified Return Statements: With named return parameters, the "return" keyword can be omitted when returning the current values of the parameters. This simplifies the function code and reduces the likelihood of introducing errors in multiple return paths.

Example:

Consider the following two Go functions:

func namedReturn(i int) (ret int) {
    ret = i
    i  = 2
    return
}

func anonReturn(i int) int {
    ret := i
    i  = 2
    return ret
}

In the namedReturn function, the return parameter is named ret. This name clearly indicates that the function returns an integer value. In contrast, the anonReturn function does not name the return parameter, which makes its purpose less obvious.

Considerations:

While naming return parameters can provide benefits, there are also potential drawbacks to consider. One such drawback is the risk of variable shadowing, where a local variable with the same name as the return parameter could accidentally override it.

Despite this potential issue, naming return parameters remains a valuable practice in Go. Effective Go emphasizes its utility for documentation and code simplification.