# null

• null is actually a value and a type of object that can be set for a variable
• You can check for null values using an equality operator

var a = null;
a === null // true

# undefined

• undefined is a variable that's been declared but hasn't been assigned a value
• undefined is its own type

var a;
console.log(typeof a); // undefined
a === undefined // true
a == undefined // true

# Not falsy

• Neither null or undefined are not equal to the boolean value false but they are falsy values

var a = null;
!a // true
a === false // false

var b;
!b // true
b == false // false