Booleans

Go doesn't have a quick way to evaluate if something is"truthy".In Python, for example, you can use an if statement on any type andmost types have a way of automatically converting to True orFalse. For example you can do:

  1. x = 1
  2. if x:
  3.     print "Yes"
  4. y = []
  5. if y:
  6.     print "this won't be printed"

This is not possible in Go. You really need to do it explicitly forevery type:

  1. x := 1
  2. if x != 0 {
  3.     fmt.Println("Yes")
  4. }
  5. var y []string
  6. if len(y) != 0 {
  7.     fmt.Println("this won't be printed")
  8. }

Python

  1. print True and False  # False
  2. print True or False  # True
  3. print not True  # False

Go

  1. package main
  2.  
  3. import "fmt"
  4.  
  5. func main() {
  6.     fmt.Println(true && false) // false
  7.     fmt.Println(true || false) // true
  8.     fmt.Println(!true)         // false
  9.  
  10.     x := 1
  11.     if x != 0 {
  12.         fmt.Println("Yes")
  13.     }
  14.     var y []string
  15.     if len(y) != 0 {
  16.         fmt.Println("this won't be printed")
  17.     }
  18.  
  19. }