如何建立混合数组

In ruby I can created array is filled with types:

[1, 'hello', :world] # [Fixnum, String, Symbol]
=> [1, "hello", :here]

How to implement a similar array is filled with mixed types in Go?

How to declare the array?

You can do that via the empty interface - interface{}:

arr := make([]interface{}, 0)

arr = append(arr, "asdfs")
arr = append(arr, 5)

or in literal form:

arr := []interface{}{"asdfs", 5}

Whenever you want to use a value of that array you need to use a type assertion.