What is the concept of JavaScript typeof function?

The typeof operator in JavaScript is used to return the type information in the form of string.
In JavaScript language, there are seven values which gives typeof returns.
In order to work on function, you need to keep this thing in mind that the typeof function will return a string which points out the type of the unevaluated operan d. Here, we are going to explain this concept in detail. We will explain the syntax as well as the requirements to use this type of function in your codes.

Syntax of typeof function:

This typeof function is charted through its operand.
Here, we would like to add that operand is just an expression which represents the object or else the primitive. The objects which are represented are those whose types are supposed to be returned. Now, if you are concerned about the parenthesis then you must learn that parenthesis are optional in typeof function.

Syntax: Typeof unaryexpression

Now, we are going to share a table which will explain the probable return values of typeof.
As we have mentioned above, there are seven possible values of typeof return function.
These values are unknown, undefined, function, object, Boolean, string as well as number.


The typeof function is supported by most of the engines.
Quirks, Internet Explorer 6 standards, Internet Explorer 7 standards, Internet Explorer 8 standards, Internet Explorer 9 standards, Internet Explorer 10 standards as well as in Internet Explorer 11 standards. It is also supported by many store applications. For instance in windows 8 and in windows 8. 1. Here, we would like to add that sometimes, it is necessary to learn whether a particular variable is defined or not.
But, it is not essential for all scripting scenarios.
These are applicable on few scripts.
You can make a typeof function in such a way that whenever you call it, a new window is created each time. You can play with this code and apply several other things on it. It will help you to improve your programming skills. By changing a code little bit, you can open a new window and load it again and again no matter how many times the function is being called for.



Boostlog is an online community for developers
who want to share ideas and grow each other.

Delete an article

Deleted articles are gone forever. Are you sure?