Since a variable can hold numerous data types, it is important to ensure that the value of a variable is the expected data type. In JavaScript, this can be done with the typeof operator or method. They both pretty much do the same thing but have syntax differences. Typeof operator
Syntax Error Another error is a syntax error. This is when your code violates the standards of the language. For example, if we utilize a restricted keyword incorrectly… If we console log the variable “class” out, we will see the error…SyntaxError: Unexpected token class. This is because “class” is a
Anytime you are coding, errors are going to occur. As you gain experience, you will get better at either not making errors, or recognizing errors and why they occur. Let’s take a look at some common errors to understand them and why they occur. Reference Error This error occurs when
Variable declaration Variables in JavaScript can be declared in two ways. By using the keywords of “var” or “let”. var syntax: Let syntax: Var is the older way to declare a variable, while let is a newer way. It is recommended to utilize let in modern JavaScript programming, but you
I have written previously about private methods. It is important to understand how JS deals with private and public versus privileged objects. I plan on doing a post in the future about closures as those are a key way to handle the protection of your code, yet exposing what the
Sometimes, we need methods in our constructor that do some work only in the constructor. There might be some internal maintenance that needs to be done. We might simply want to protect some data, etc. We declare a private method by using an inner function. If we try to run
