JavaScript Truthy and Falsy Quiz

Test your JavaScript Truthy and Falsy Understanding

JavaScript Quiz #06 - Truthy and Falsy Values

What are Truthy and Falsy Values In JavaScript? How to use Truthy and Falsy Values in JavaScript?

4 mins read

console.log(!!"0");

true

false

 var x = " ";

console.log(Boolean(x));

true

false

" "

 console.log(Boolean(Symbol()));

true

false

Symbol

{ }

[]

-1

console.log(0 || "Hello" && (null ?? true));

"Hello"

null

true

 console.log("" === false);

true

false

 console.log(Boolean(-42));

true

false

 let obj = {
    prop1: {
       prop2: null
    }
 };
     
 console.log(obj.prop1?.prop2 ?? "Default value");

null

"Default value"

false

  console.log(Boolean(-0))

true

false