How do I use wrappers in JavaScript?

What are wrappers in JavaScript?

In JavaScript, wrappers are objects that allow primitive data types to be treated as objects. For example, the String, Number, and Boolean types have corresponding wrapper objects.

Can you give me an example of a wrapper in action?

Sure! For instance, when you create a string like this: let str = 'Hello';, JavaScript automatically wraps it in a String object, allowing you to use methods like str.toUpperCase().

Are there any performance implications of using wrappers?

Yes, using wrappers can have performance implications because they create additional objects in memory. It's generally better to use primitive types when possible.

How do I convert a primitive to a wrapper?

You can convert a primitive to a wrapper by simply using the constructor. For example, let numWrapper = new Number(5); creates a Number object from the primitive 5.