Sometimes, we want to define a variable if it doesn’t exist with JavaScript.
In this article, we’ll look at how to define a variable if it doesn’t exist with JavaScript.
How to define a variable if it doesn’t exist with JavaScript?
To define a variable if it doesn’t exist with JavaScript, we use the nullish coalescing operator.
For instance, we write
someVar = someVar ?? "Default Value";
to assign "Default Value" to someVar if someVar doesn’t exist.
The nullish coalescing operator is ??.
Conclusion
To define a variable if it doesn’t exist with JavaScript, we use the nullish coalescing operator.
