How does JavaScript handle properties and methods for primitives, like strings?

In JavaScript, when you attempt to access properties or methods on primitive types like strings, the language automatically converts the primitive value into an object temporarily. This process allows you to utilize the various string methods, such as .length, .toUpperCase(), or .substring(), despite the fact that strings are primitive types.

This behavior occurs due to JavaScript's use of a temporary "wrapper" object for the primitive value. When you call a method on a string, JavaScript creates a new instance of the String object, calls the method on that instance, and then discards it once the operation is completed. This is why you can invoke methods on string literals or string primitives without error—the temporary object enables this functionality.

The other choices do not accurately describe how JavaScript handles this process. For instance, primitive types indeed can have methods and properties, albeit through the temporary object conversion. Direct modification of the primitive value is not allowed, as primitives are immutable, and throwing a TypeError would not occur in this context when accessing properties or methods.