Return all contents within an object - go

Question

I am very new to Go, so I am sorry for that noob question.
In JavaScript console.log(window) returns all objects inside of window. In PHP var_dump(new DateTime()) returns all objects inside of DateTime().
Is there a function in Go that will return all objects from a given object? For example Println should be returned if fmt is given.

Answer 1

Try executing go doc fmt in a terminal to produce a description of the "fmt" package and a listing of the functions it exports, or referring to the fmt package documentation at https://golang.org. In go, as in most other static/compiled languages, users are expected to refer to documentation (or docs) which describe the programming language and its libraries. Contrast this to some dynamic/scripting languages, which often make it easy to query any object to discover its usable properties.
At runtime, you can get a helpful printout of any arbitrary value by using the %#v formatting verb to produce a go syntax representation of the value, e.g.
xs := []int{1, 2, 3}
fmt.Printf("OK: xs=%#v\n", xs)
// OK: xs=[]int{1, 2, 3}
Note that the package "fmt" is not a value in the go language so it cannot be printed at runtime as such.

Answer 2

In Go is possible does something similar, but don't work for all.
func main() {
//arrays
a := []int{1,2,3,4}
fmt.Printf("%v\r\n", a) //print [1 2 3 4]
//maps
b := map[string]int{
"a":1,
"b":2,
}
fmt.Printf("%v\r\n", b) //print map[a:1 b:2]
//structs
c := struct{
A int
B int
}{1,2}
d := struct{
C struct{
A int
B int
}
D int
}{c,2}
fmt.Printf("%v\r\n", d) //print {{1 2} 2}
}
See in: https://play.golang.org/p/vzlCsOG497h
If you pass fmt occurs error because it is a package. The error is:
Error: use of package fmt without selector
I hope this helps (too)!

Answer 3

GO OOP, & inheritance
Go does not have objects, but we do have custom types and interfaces that we can attach attributes, functions and other types to.
What specifically are you trying to do? If you're looking for a var_dump:
USING fmt.Println
someErr := fmt.Errorf("custom type error")
fmt.Println(someErr)
Println formats using the default formats for its operands and writes to standard output.
USING fmt.Printf
someErr := fmt.Errorf("custom type error")
fmt.Printf("This is an error:%v A num: %v A str", someErr, 19, "Stackoverflow")
Printf formats according to a format specifier and writes to standard output.
USING fmt.Sprintf
someErr := fmt.Errorf("custom type error")
// someStr now contains the string formatted as shown below
someStr := fmt.Sprintf("This is an error:%v A num: %v A str", someErr, 19, "Stackoverflow")
Sprintf formats according to a format specifier and returns the resulting string.
Here is an example of my personal preference when outputting var data:
https://play.golang.org/p/8dpeE-fray_J
I hope this helps!