Undefined

What is Undefined

Undefined is also a data type in JavaScript just like the null. When a variable is created or declared without assigning any value to it, then the value of the variable will be set as undefined by default.


              12
            
let age;
console.log(age);

Task

Swipe to show code editor

Declare a variable numberOfItems and assign the value of undefined to the variable and show the value of the variable.

So, undefined variables can also be declared using the undefined keyword.

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Everything was clear?

Thanks for your feedback!

Section 3. Chapter 31

Undefined

What is Undefined


              12
            
let age;
console.log(age);

Task

Swipe to show code editor

Declare a variable numberOfItems and assign the value of undefined to the variable and show the value of the variable.

So, undefined variables can also be declared using the undefined keyword.

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Thanks for your feedback!

Section 3. Chapter 31

Undefined

What is Undefined


              12
            
let age;
console.log(age);

Task

Swipe to show code editor

Declare a variable numberOfItems and assign the value of undefined to the variable and show the value of the variable.

So, undefined variables can also be declared using the undefined keyword.

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Thanks for your feedback!

What is Undefined


              12
            
let age;
console.log(age);

Task

Swipe to show code editor

Declare a variable numberOfItems and assign the value of undefined to the variable and show the value of the variable.

So, undefined variables can also be declared using the undefined keyword.

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Section 3. Chapter 31

Switch to desktop for real-world practiceContinue from where you are using one of the options below