![]() ![]() Also, we can intentionally assign the null value to the variable to keep it empty, also called the null variable. The type of the Null variable is an object, and when we don’t assign any value to the Null variable, it automatically assigns the ‘undefined’ value. Null variable − It is a declared variable, but we haven’t assigned any value to it. Undefined variable − It is a variable not declared in the program, and the compiler doesn’t know anything about that variable. ![]() We can say that the Null and undefined variables are almost the same but not identical. Still, we can use some operators such as typeof operator and equality operator to check the variable.īefore we proceed with the tutorial, let’s clear the doubt between the null, undefined, or blank variable. There is no particular built-in library function to check whether a variable is undefined or null. In this tutorial, we will learn to check for null, undefined, or blank variables in JavaScript.
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