Boolean Data Type #

A boolean data type in Go is declared with the bool keyword and can only hold two possible values: true or false.

The default value of a boolean variable is false.

Example #

This example demonstrates different ways to declare boolean variables:

package main
import ("fmt")

func main() {
  var b1 bool = true    // typed declaration with initial value
  var b2 = true         // untyped declaration with initial value
  var b3 bool           // typed declaration without initial value
  b4 := true            // untyped declaration with initial value

  fmt.Println(b1) // Returns true
  fmt.Println(b2) // Returns true
  fmt.Println(b3) // Returns false
  fmt.Println(b4) // Returns true
}

Output: #

true
true
false
true

Note: Boolean values are mostly used for conditional testing, which you will learn more about in the Go Conditions chapter.