Go - Variables & Constants

Declaring

var a int = 1
var b = 2           // inferred
aLong := 3         // function scope only
const Version = "1.0.0"

Multiple and Grouped

var (
  i int
  s string
)
const (
  Pi = 3.14159
  E  = 2.71828
)

Naming

• Exported names start with uppercase: MyType.
• Keep names short and meaningful; prefer clarity.

Common errors

• Using := at package scope (allowed only inside functions).
• Re-declaring a variable with := in the same scope unintentionally—use = to assign.

Practice

• Create grouped var and const blocks; print their values with fmt.Printf.

Quick quiz

1. When do you use var vs const?