Go Constants:

Constants are fixed values that cannot be changed during the execution of a program. They are declared using the const keyword in Go.

Basic Constant Declaration

Constants can be declared individually or in groups. Here's a simple example:

const Pi = 3.14
const Greeting = "Hello, Go!"

Grouped Constants

You can declare multiple constants together using parentheses:

const (
  A = 1
  B = 2
  C = 3
)

Untyped Constants

Go allows untyped constants that take their type when assigned to a variable:

const x = 42
var y int = x

Using iota

iota is a built-in identifier used to simplify the definition of incrementing constants.

const (
  First = iota
  Second
  Third
)

Key Points

• Constants are evaluated at compile-time.
• They cannot be changed once declared.
• iota helps generate sequences easily.
• Typed and untyped constants both exist.