Understanding Javascript Variables

Hi, everyone today we are going to learn one of the basics in javascript

What are Variables

Variables are like containers used for holding or storing information.

Declaring a variable in Javascript

In Javascript they are three ways of declaring a variable. Variables are created using the following keywords

1. var

2. let

3. const

   

Rules for Naming Variables in Javascript

When naming variables, make the names more descriptive, easily understandable that indicate their content and usage . For example sellingPrice rather than x and y.

Lets discuss the rules for javascript variable naming

1. Variables should not be keywords. Keywords are reserved words that are used in part of the javascript syntax. For example let let is invalid.

2. Variables should either begin with a letter, underscore and dollar sign.

   Example

   

   3. Variables should not contain spaces. For example const first name

   4. Variables should not start with a number or special characters except for the dollar sign. For example const 1firstName

   5. By convention Javascript variables should be written in camelCase.

      How to store data in a variable

In the previous examples, we discussed how to declare a variable and the rules for variable naming. In this section, we will explore how to store data in a variable

To store data in a variable we use the = symbol which is known as an assignment operator.

The assignment operator is used to assign a value to a variable. For example, declaring a variable and simultaneously assigning a value to it is referred to as initializing a variable.

That’s a wrap! I hope you’ve learnt something new today