golang make函数如何可以接受三个参数？

Question

The function make is describe like this:

func make(Type, size IntegerType) Type

When we use make for slicing sometimes it shows like:

make([]int, 0, 10) 

So my question is:

How can the make function take three parameters? The size IntegerType is not Vararg. I'm confused...

Answer 1

The function make is a builtin function. The function has several features not available to other functions. One is that it takes a variable number arguments as you noted. Another is that the first argument is a type.

The function definition func make(Type, size IntegerType) Type is for documentation purposes only. It is not the actual definition of the function.