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);

Завдання

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

Завдання

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.

Перейдіть на комп'ютер для реальної практикиПродовжуйте з того місця, де ви зупинились, використовуючи один з наведених нижче варіантів

Все було зрозуміло?

Секція 3. Розділ 31

Undefined

What is Undefined


              12
            
let age;
console.log(age);

Завдання

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

Завдання

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.

Все було зрозуміло?

Секція 3. Розділ 31

Undefined

What is Undefined


              12
            
let age;
console.log(age);

Завдання

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

Завдання

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.

Все було зрозуміло?

What is Undefined


              12
            
let age;
console.log(age);

Завдання

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.

Секція 3. Розділ 31