相当于JavaScript参数的Golang吗？

Question

Is there a golang way to get a function's runtime arguments?

I'm asking because I'm trying to write a function that takes a function and a string, and then outputs the string and the runtime arguments.

Answer 1

Unlike JavaScript where a function can be called with extra arguments not included in the declaration, calls to Go functions must match the function signature. So there isn't a need for the special arguments global.

With that said, it is possible to write variadic functions that can take a variable number of arguments. For example, the following function will accept a string followed by any number of integer arguments:

func foo(s string, args ...int) {
    ...
}

In the function body args will be an []int slice, so you can determine how many arguments were passed with len, and iterate through them as you would with any other slice.

If you want to accept arguments of any type, you can use the blank interface as the type:

func bar(args ...interface{}) {
    ...
}

Now args will be an []interface{} slice. You can unpack the values passed in using a type assertion or type switch.