How Can I Simulate Named Function Arguments in Go?

Passing Function Arguments by Field Name

In Go, function calls require arguments to be listed in the same order as the function parameters. However, you might prefer to specify arguments explicitly by their names like this:

MyFunction(name: "Bob", address: "New York", nick: "Builder", age: 30, value: 1000)

Non-Named Arguments Not Supported

Unfortunately, Go does not support named arguments for functions. As mentioned in the Go specification, you must specify values in the expected order for all non-variadic parameters.

Option 1: Use a Struct Wrapper

To imitate named arguments, you can create a struct that wraps the function parameters:

type Params struct {
    name, address, nick string
    age, value          int
}

func MyFunction(p Params) {
    // perform some operations using p.name, p.address, etc.
}

func main() {
    MyFunction(Params{
        name:    "Bob",
        address: "New York",
        nick:    "Builder",
        age:     30,
        value:   1000,
    })
}

Option 2: Use a Helper Function

If you cannot modify the original function, create a helper function that takes a struct parameter and calls the original function with the appropriate fields as arguments.

func MyFunction2(p Params) {
    MyFunction(p.name, p.address, p.nick, p.age, p.value)
}

func main() {
    MyFunction2(Params{
        name:    "Bob",
        address: "New York",
        nick:    "Builder",
        age:     30,
        value:   1000,
    })
}

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