Alert: Post is under development on 13-Aug-2021.

In the previous installment of the Variable, we learnt the following:

• Purpose of a variable,
• Creation of a variable
• Overview of usage of Interpreter, etc.

In this part, we are going to learn further. Let's read on.

What are other rules to create a variable?

Answer: Let's have a look at other rules to create a variable in JavaScript coding.

• We should use an 'underscore' (_)character to create a more legible variable name. Eg.

  let _productCategory;
  let employee_address_detail;
  let dropDownList_Open;
  

• We may use a combination of letters and digits. Eg.

  let name5ThGrade = '5 (B)'
  let discount25P = '25%'
  

• We should avoid using 'digits' & all special characters (except _ and $) as names for a variable. It is quite difficult to comprehend by an Interpreter of JavaScript language. The following is a big No in any programming language!

  let first name = "Nikhil";
  let first+name = "Nikhil";
  let 2222 = 10;
  

  Don't use it at all to save yourself from run-time errors. Errors halt our program/ application which is certainly an undesirable situation.

• We are allowed to use a '$' character to name a variable. But it has a very special purpose in creating Java Script. Thus we must not until we know what we are doing.

• We use camelcase for creating variables in JavaScript. Eg.

  let myVariable, productName, productCode, productPrice;
  

  Yes, you can declare more than one variable using a single let keyword.

What are other types of variables available in JavaScript?

Answer: Stay tuned

---

Go to Part 1