Skip to content
  • Quizes
  • QStack
  • Blog
  • pinterest
  • instagram
  • twitter
  • linkedin
  • facebook
W3 Coding Schools
  • Home
  • HTML
    • HTML Introduction
    • HTML Editors
    • Fundamentals of HTML
    • Elements of HTML
    • HTML Attributes
    • HTML Headings
    • HTML Paragraphs
    • HTML Style Attribute
    • HTML Text Formatting
    • HTML Phrase Tags
    • HTML Comments
    • HTML with CSS
    • HTML Links
    • HTML Images
    • HTML Tables
    • HTML Lists
    • HTML Blocks
    • HTML Class Attribute
    • HTML Id Attribute
    • HTML Iframes
    • HTML JavaScript
    • HTML File Paths
    • HTML Head
    • Computer Code Elements
    • HTML Entities
    • HTML Charset
    • HTML URL Encode
    • HTML and XHTML
    • HTML Layouts
    • HTML Forms
    • HTML Form Elements
    • HTML Form Input Types
    • HTML Input Attributes
    • HTML5 Introduction
    • HTML5 New Elements
    • Semantic Elements
    • HTML5 Migration
    • Style Guide
    • HTML Canvas
  • CSS
    • CSS Introduction
    • CSS Syntax and CSS Comments
    • CSS Selectors
    • How to add CSS to a Webpage
    • CSS Color Basics
    • CSS Background Properties
    • CSS Border Properties
    • CSS Margin and Padding Properties
    • CSS Height and Width properties
    • CSS Box Model
    • CSS Outline Properties
    • CSS Fonts
    • CSS Text
    • How To Add Icons
    • CSS Links
    • CSS List-Style
    • CSS Tables
    • CSS Display Property
    • CSS Position Property
    • CSS Overflow Property
    • CSS max-width Property
    • CSS Float and Clear Properties
    • CSS Alignment
    • CSS inline-block
    • CSS Combinators
    • CSS Pseudo Classes
    • CSS Pseudo Elements
    • CSS Opacity
    • CSS Navigation Bar
    • CSS Dropdowns
    • CSS Image Gallery
    • CSS Image Sprites
    • CSS Attribute Selector
    • CSS Styling Forms
    • CSS Counters
    • CSS Units
    • CSS Specificity
    • CSS Website Layout
    • CSS Rounded Corners
    • CSS Border Image Property
    • CSS Multiple Backgrounds
    • CSS Gradient
    • CSS Shadow Effects
    • CSS Text Effects
    • CSS Web Fonts
    • CSS 2D Transforms
  • Bootstrap 4
    • Bootstrap 4 – Introduction
    • Bootstrap versions
    • Bootstrap 4 Layout
    • Bootstrap 3 Vs Bootstrap 4
    • Bootstrap 4 Grid System
    • Bootstrap 4 Typography
    • Bootstrap 4 Colors
    • Bootstrap 4 Images
    • Bootstrap 4 Tables
    • Bootstrap 4 Jumbotron
    • Bootstrap 4 Figures
    • Bootstrap 4 Alerts
    • Bootstrap 4 Buttons
    • Bootstrap 4 Button Group
    • Bootstrap 4 Badges
    • Bootstrap 4 Spinners
    • Bootstrap 4 Progress Bars
    • Bootstrap 4 Pagination
    • Bootstrap 4 Breadcrumbs
    • Bootstrap 4 List Groups
    • Bootstrap 4 Cards
  • jQuery
    • jQuery Introduction
    • jQuery Download
    • jQuery Selectors
    • jQuery Event Methods
    • jQuery Hide/Show Effects
    • jQuery Fading Effects
    • jQuery Sliding Effects
    • jQuery Animation
    • jQuery Stop and Callback
    • jQuery Get and Set Methods
    • jQuery Chaining
    • jQuery Add
    • jQuery Remove
    • jQuery CSS Classes
    • jQuery Style Properties
    • jQuery Dimensions
    • jQuery Traversing
    • jQuery Ancestors
    • jQuery Descendants
    • jQuery Siblings
  • Javascript
    • JS Introduction
    • JS Where to Put
    • JavaScript Syntax
    • JavaScript Comments
    • JavaScript Variables
    • JavaScript Data Types
    • JavaScript Operators
    • JavaScript Events
    • JavaScript Strings
    • JavaScript Numbers
  • php
    • PHP Introduction
    • Install PHP
    • PHP Syntax and Comments
    • PHP Variables
    • PHP Constants
    • PHP Echo and Print
    • PHP Data Types
    • PHP Strings
    • PHP Operators
    • PHP $ and $$ Variables
  • WordPress
    • WordPress Introduction
    • WordPress History
    • WordPress.com vs WordPress.org
    • How to Install WordPress
    • WordPress Dashboard
    • How to Create a WordPress Website
    • WordPress Posts
    • WordPress Pages
    • WordPress Posts vs Pages
    • WordPress Categories
  • SEO
    • SEO Introduction
    • SEO Tactics and Methods
    • SEO Relevant Filenames
    • SEO Domain Name
    • Website Design and SEO
    • SEO Keywords
    • Meta Tags Optimization
    • Title Tag Optimization
    • Anchor Text Optimization
    • Content Optimization
  • Android
    • Android Introduction
    • Android History and Versions
    • Android Architecture
    • Android Environment Setup
    • Android Application Components
    • Hello World Application
    • Android Activities
  • iOS
    • iOS Introduction
    • iOS Environment Setup
    • iOS Architecture

You Are Here

  • Home
  • Learn Javascript
  • JavaScript Syntax

Topics

  • JavaScript Numbers
  • JavaScript Strings
  • JavaScript Events
  • JavaScript Operators
  • JavaScript Data Types
  • JavaScript Variables
  • JavaScript Comments
  • JavaScript Syntax
  • JS Where to Put
  • JS Introduction

Oct Champs & Prizes

  • 1. Pooja Ladda
  • 2. Manjali Kuldharan
  • 3. Pranali Surawar
  • 4. Anjali Kulkarni
  • 5. Vishal Deshmukh

Recent Posts

  • HTML Media
  • jQuery Siblings
  • Bootstrap 4 Cards
  • jQuery Descendants
  • jQuery Ancestors

JavaScript Syntax

JavaScript is implemented using Javascript statements that are placed between the <script>….</script> tags on a web page.
The JavaScript syntax is the set of rules that define a correctly structured JS program.
A JavaScript syntax consists of JavaScript statements that are placed within the <script> tag or within the external JS file having .js extension.
The following example demonstrates how JavaScript statements look like:

Example:

var x = 8; // Variable declaration
var y = 9; // Variable declaration
var sum = x + y; // Compute value of variables
Try it

Case Sensitivity in JavaScript:

JavaScript is case-sensitive, it means that variables, function names, language keywords, and other identifiers must be typed with a constant capitalization of letters.
For example, the variable firstVar must be typed firstVar, not FirstVar or firstvar. Similarly, the method name getElementById() must be typed getElementById() not as getElementByID().

Example:

var myname, myName;
myname = "David";
myName = "Jolly";
Try it
In the above example the variables myName and myname, are two different variables.

Whitespace and Line Breaks:

JavaScript does not consider spaces, tabs, and newlines that appear in the JavaScript programs. You can use spaces, tabs, and newlines easily in your JavaScript program and you can format and indent your programs in a neat and consistent way that makes the code easy to read and understand.

Semicolons are Optional:

The statements in JavaScript are normally followed by a semicolon, just as they are in C, C++, and Java.
JavaScript allows you to omit the semicolon if each of your statements is placed on a new line.
For example, you can write the following code without semicolons.

Example:

<script>
var1 = 5
var2 = 6
document.getElementById("demo").innerHTML = var1;
</script>
Try it
But when we format JavaScript statements in a single line as follows, you must use semicolons.

Example:

<script>
var1 = 5; var2 = 6;
document.getElementById("demo").innerHTML = var1;
</script>
Try it
Note: It is a good practice to use semicolons while programming.

JavaScript Identifiers:

Identifiers in JavaScript are names given to variables, functions, etc. Identifiers in JavaScipt are the same as identifiers in other programming languages like C, C++, Java, etc.
While naming JavaScript variables, keep the following rules in mind:
  • Don't use any of the JavaScript reserved keywords as a variable name.
  • JavaScript variable names should not start with numbers (0-9). They must start with a letter or an underscore character.
  • JavaScript variable names are case-sensitive.

Post navigation

JS Where to Put
JavaScript Comments

Ask a Question Cancel reply

Your email address will not be published. Required fields are marked *

W3 CODING SCHOOLS © Copyright 2019-20
Privacy policy   Terms of use

We use cookies to ensure that we give you the best experience on our website. If you continue to use this site we will assume that you are happy with it.Ok