Booleans in GoLang

In this post, we will discuss boolean values and operators in GoLang.

Boolean values in Go

Boolean values are those which can be assigned true or false and has the type bool with it.

package main

import (
	"fmt"
)

func main() {
	var bVal bool   // default is false
	fmt.Printf("bVal: %v\n", bVal)
}

In the code above “bVal” is not initialized and thus has a zero-value. The zero-value for a boolean is false.

Boolean operators in Go

Boolean operators are those operators that compare one value to others.

Below shown six different boolean operators that evaluate to bool.

package main

import (
	"fmt"
)

func main() {
	// boolean operators
	a := 3
	b := 4
	fmt.Println(a == b)  // false
	fmt.Println(a != b)  // true
	fmt.Println(a < b)   // true
	fmt.Println(a > b)   // false
	fmt.Println(a >= b)  // false
	fmt.Println(a <= b)  // true
}

Conversion from strings

Strings can be converted to boolean and vice-versa using the strconv package as shown below.

package main

import (  
    "fmt"
    "strconv"
)

func main() { 
	var a bool
	
	s := "True"  // s can be 1, True, TRUE, False, false, 0 etc
	a, _ = strconv.ParseBool(s)  // observe that second value returned is ignored
                                     // here, because it returns true if it can be converted
                                     // else it resturns false
	 
	fmt.Println(a) // prints true
}

Strings from a boolean

A boolean can be converted to a string as well using the strconv package.

package main

import (  
    "fmt"
    "strconv"
)

func main() { 
	var a string
	b := false
	a = strconv.FormatBool(b)
	fmt.Println(a)            // prints "false"
}