Test for null object in javascript

So just using the Object. But what happens when we create a new object instance using these other constructors. What if you need to support older browsers? Heck, who am I kidding! We can stick with vanilla or utilize a library. And we're covered for null and undefined. It will return false and not throw a TypeError. There are tons of external libraries you can use to check for empty objects. The answer is it depends! I'm a huge fan of going vanilla whenever possible as I don't like the overhead of an external library.

But if your app already has an external library installed, then go ahead and use it. You will know your app better than anyone else. What do you believe in? Add a comment. Active Oldest Votes. Community Bot 1 1 1 silver badge.

Wex Wex Dennis Dennis Alaeddine Alaeddine 1, 2 2 gold badges 20 20 silver badges 43 43 bronze badges. James Drinkard James Drinkard Try this if! The case I'm almost always looking for and I'd like to have a really good "always use" pattern is Is it a non null, non empty string — Peter Kellner. Otherwise this will cause an error. Sign up or log in Sign up using Google. Sign up using Facebook.

Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Circle class has a static method called create that returns a new Circle object with a specified radius.

To check if a value is not null , you use the strict inequality operator! Besides false , 0 , an empty string '' , undefined , NaN , null is a falsy value. It means that JavaScript will coerce null to false in conditionals. For example:. In this example, the square variable is null therefore the if statement evaluates it to false and executes the statement in the else clause.

In JavaScript, null is a primitive value, not an object. It turns out that this is a historical bug from the first version of JavaScript that may never be fixed.