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.
12let age; console.log(age);
Swipe to start coding
Declare a variable numberOfItems and assign the value of undefined to the variable and show the value of the variable.
Soluzione
So, undefined variables can also be declared using the undefined keyword.
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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.
12let age; console.log(age);
Swipe to start coding
Declare a variable numberOfItems and assign the value of undefined to the variable and show the value of the variable.
Soluzione
So, undefined variables can also be declared using the undefined keyword.
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