Your How-to Guide to a Javascript Null Check

A null is anything that is virtually non-existent. In Javascript, null parameters enable programmers to designate a variable without putting a value to it. A null value is one of Javascript’s 6 falsy values together with undefined, zero, false, empty string, and NaN (Not A Number). Additionally, a null is one of the primitive values in JavaScript. Programmers use null values for integers, strings, and other simple variables. They are also commonly utilized for Web page objects. Nevertheless, if it needs to be used for object manipulations and other calculations, null values are quite taxing to use. If a programmer needs to use a defined variable in a code, a JavaScript null check is necessary before proceeding to execute the code to lessen the number of errors.  Here is a step-by-step how-to-guide to help you get through without difficulty:

Step 1: Determine the value that you are to use. Type this in your Javascript code:

var myVal = null;

This is the value to allot memory and will establish the variable to be used.

Step 2: Analyze if the variable is a null value. In some cases, you may use an executable code to check if the value is null or not. Wrap your code in the statement below:

if (myVal== null) {


If myVal is null, then it will be possible to proceed with executing the code.

Step 3: Another way to assess if a variable is null or not, you may also proceed to run a code with a variable with a value. Using the “!” operator will enable a compiler to still run statements even if the result may be false. Use this statement in your JavaScript if myVal is not null:

if (!name) {



While a null technically means nothing, in JavaScript, it is an important data type, and to remove the value in a variable, a programmer can simply input “null” to it. However, in most cases, a null value is not fundamentally applied to a variable, which may end up as errors when codes are executed. Therefore, a JavaScript null check is essential to prevent code errors prior to the execution of code.

Leave a Reply

Your email address will not be published. Required fields are marked *