Variables and Types

Declare with var

Name the type after the variable. Zero values apply when you omit an initializer.

package main

import "fmt"

func main() {
	var name string = "Go"
	var lessons int
	lessons = 18
	fmt.Println(name, lessons)
}

Use short declaration

Inside functions, := declares and infers the type from the value.

count := 3
ready := true
fmt.Println(count, ready)

Common basic types

• int, int64, float64
• string for text
• bool for true/false
• byte is an alias for uint8

Constants

Constants are declared with const and cannot change.

const MaxLessons = 20
fmt.Println(MaxLessons)