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Table of Contents

Using variables in node.js – how to use variables of different types
Explaining Scope of a variable
Derive the importance of defining a variable.
Determining the input type of a variable.
In any programming language, variables are an essential part of the code. They allow you to store and manipulate data, which is at the heart of any application. This comprehensive step-by-step tutorial will walk you through the process of setting up and using variables in Node.js.

What Are Variables in a programming language?

A variable is a container to store some data which can be accessed or altered later. It is defined by a type, name, and a value. The value can be a new chapter for Cybersecurity string, date, number, an information in the memory, reference to a code block or a result of a calculation.

Like every programming language a variable is used for the same fixed purpose as defined above and the same principles and use cases applies for using variables in node.js.

How to declare the type and name of a variable in node.js?

The most common way to is to use a keyword mentioning the type of variable followed by the name of the variable and then assigning a value to it.
var stringData = “welcome to node.js coding”
var numberData = 123
var decimalData = 123.4567

This is how basically a variable is defined and declared in node.js, later in this article we will see how to change or alter the contents of a variable.

What is a restful API are the most commonly used types of variables in programming?

The most common types of variables every programming languages have are :
String – characters or pieces of text
Number – numbers that represent a specific quantity
Boolean – true or false evaluation based on a condition
Arrays – stores arrays which can be single or multi-dimensional values of the above defined variable types

These are the most widely used variable types in node.js and the use case for each type of variables has its own set of properties and goals attached to them which we will describe here.

What are the characteristics of a variable in a programming language?

Type – specifies what kind of values to hold(either one of Integer, float, string etc)
Name – describes the name of the variable through which it can be accessed
Scope – specifies the accessible span of the variable(Global or local)
Here is the description of these characteristics

Using variables in node.js – how to use variables of different types

Number data type variables are used to store numeric data, such as numbers, percentages, and decimals. They can either be integer or floating point, and they can take on any value between -9007199254740991 and 9007199254740991 to store in such variables. The floating point variables have a larger decimal point storage capability.

String variables are used to store text data, such as names, addresses, and phone numbers. They can also contain special characters, and they can be either single or double-quoted.

var customer1Email = “customer1.email@example.com” //used to store email address

var customer1Name = “John Doe” // to store the name of the customer

Boolean variables are used to store two states in order to conclude the result of an evaluation which can be true or false.

For Example –

var booleanVal = false //initially we set the value to be false, and we will use this to evaluate an expression

var a = 5, b =7

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