Over some years, Javascript has been keeping it as one of the most popular scripting languages. It is one of the core web technologies and a beginner-friendly language. It can easily be understood by a non-specialist and has a simpler syntax. One can easily perform as a front-end and back-end developer by grasping its concepts.
There are several JavaScript frameworks and libraries. Javascript Libraries like React.js, JQuery, Express, etc., have been in great demand. AngularJs, Bootstrap, and Node.js are the perfect examples of Javascript frameworks.
Here, this article will discuss the types of JavaScript variables, how to declare them, and the rules we have to follow while naming a variable.
Table of Contents: Types of JavaScript Variables |
JavaScript(JS) is a widely used scripting language. It is an object-oriented dynamic programming language for computers. It is often used as a major component of websites, whose implementations enable the client-side script to communicate with users and create dynamic pages. The live script was the original name of JS.
JavaScript by Netscape may be in response to the buzz that Java was causing. The language’s general purpose is integrated into web browsers such as Netscape, Mozilla, and Internet Explorer. Client-side JavaScript mechanisms have many advantages over traditional server-side CGI scripts. When the user submits the form, the javascript code is executed, and he is submitted to the web server only if all the inputs are valid.
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Related Article: JavaScript Frameworks |
When learning or practicing JS or any programming language, it is important to be aware of variables. Variables are nothing other than storage bottles of values. It is exactly similar to the variable we use in mathematics for calculation, theorem proof, etc. The value of the data stored in variables can be easily used at any number of times while coding. The value is variable until the program is being executed. So variables are names of storage spaces where a value is stored. Every variable name inside a single program should be unique.
Example
x=5;
Here, x is a variable where the value 5 is stored.
Every variable must be declared before using it or assigning any value. Declaring a variable is just putting a keyword before the variable name.
Keywords can be defined simply as a word predefined in the programming language. It has its significance and cannot be used as a variable name. It has a special meaning and a function.
There are three types of keywords for a variable declaration in JS: var, let, and const.
Example
var x;
const y;
let z;
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JavaScript variables are majorly of two types
These variables are those declared inside a function.
Example
function print()
{
var age = 2;
console.log(age)
}
print();
It can only be used in another function only by passing parameters.
Example
function print()
{
var age = 2;
return(age)
}
function print2()
{
var name = “Cijin”
var years old;
yearsOld = print();
}
You can use the same variable in two different functions.
Example
function print()
{
var age = 2;
console.log(age)
}
print();
function print2()
{
var age = 4;
console.log(age)
}
print2();
Local variables are a great way to keep your code concise and easy to understand. They allow you to bind specific values within a block of code, which makes it easier to track changes and troubleshoot issues. Additionally, they offer the flexibility of accessing these values from within any function that calls that block of code.
Global variables are those variables declared globally or outside function declaration. They can be used in any function without passing any parameters to the function.
Example
var age=2;
function print()
{
console.log(age+1)
}
function print2()
{
console.log(age+3)
}
function print3(){
console.log(age+6)
}
print();
print2();
print3();
Global variables are a powerful tool that allows you to store data in one place and access it from anywhere in your code. This is helpful when you need to keep track of multiple pieces of information or when you want to share data between various parts of your application.
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Generally, people start with Html, and CSS always goes in line with JavaScript since it enhances their skills in Html and CSS. What is certain about JS is that some JavaScript framework exists for software development services. JavaScript makes the webpage responsive, and it helps in attracting more and more users. JavaScript is likely to retain its position as the most used language. Statistics and facts say a lot about its bright future. JavaScript is used in the Full stack development domain, one of the leading domains in the technological industries, and provides job opportunities. Explore it maximum.
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Madhuri is a Senior Content Creator at MindMajix. She has written about a range of different topics on various technologies, which include, Splunk, Tensorflow, Selenium, and CEH. She spends most of her time researching on technology, and startups. Connect with her via LinkedIn and Twitter .