Learning JavaScript tutorial – JavaScript Comments

JavaScript Comments allows us to add remarks and a well written explanation about the working of JavaScript code. JavaScript Comments make the code more readable, understandable for future reference. Commenting your JavaScript code makes it easier for others to understand. To increase re-usability of a JavaScript code be, sure to include comments in your scripts. Commenting your JavaScript code is the best practice of JavaScript programming and suits to your aspect of good programming style.

Any comments you include in your JavaScript code will simply ignored by the JavaScript interpreter. JavaScript supports both C++ and C-style comments. JavaScript supports two types of comments, Single-line comments and multiple-line comments.

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Learning JavaScript tutorial – Lexical Structure and Statements

A JavaScript statement is a command to a web browser to perform specific task define (program written) by the user. JavaScript Statements are written with the set of elementary rules that specifies how to write JavaScript programs. A JavaScript program is a set of one or more statements. A statement will have internal components like Variables, Literals, Identifier, reserved keywords, Comments, conditional statement, Arrays, Functions, Objects, Classes etc

JavaScript is case sensitive, in the most of cases JavaScript Statements terminated with a semicolon(;) or with Returns(Enter or line-break). Even though semicolon is optional, JavaScript Statements terminated with a semicolon(;) is the best practice of JavaScript programming.

var txtName="I love JavaScript";
var intNum=10

semicolons allows us to group multiple statements on one line.

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Learning JavaScript tutorial – First Look at Client-Side JavaScript

As we seen in our first article "Learning JavaScript – an introduction with JavaScript", JavaScript is mostly used as a client-side scripting language. With Client-side JavaScript, we are able to interpreter with the Document Object Model (DOM) of a web browser. On Client-Side, JavaScript add interactive features to your page. JavaScript allowing us to do plenty of tasks on Client-Side like mathematical calculations, form validation, drop down and sliding menus, message tickers, work with events, work with cookies, add special effects and animation, develop interactive games, customize graphics selections, and create security passwords and many more.

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Learning JavaScript tutorial – an introduction with JavaScript

JavaScript is most popular, commonly used, object-oriented, client-side scripting language. JavaScript widely used in tasks ranging from the form data validation to the development of enhanced user interfaces and dynamic websites. The primary use of Client-side JavaScript is to write functions that are embedded in or included from HTML pages and interact with the Document Object Model (DOM) of the page. Because JavaScript code can run locally in a user’s browser (instead of get parse on a remote server like PHP or ASP.NET), it can respond to user actions quickly, making an application feel more responsive and user friendly.

What can a JavaScript do for a Web Developer?

As a web developer you can use JavaScript to perform various tasks, some of them are as follows…

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How to find out duplicate records (duplicate data) in a SQL Server table

Records duplication or data redundancy is the common issue we face with SQL Server table. In this article we will find out all the duplicate records (duplicate data) in a SQL Server table. We have to use the group by with having command to get the duplicate records (duplicate data).

Syntex:
SELECT column_Name FROM Table_name
GROUP BY column_Name
HAVING count(column_Name) > 1
 
Example:
SELECT studentName FROM tblStudentDtl
GROUP BY studentName
HAVING count(studentName) > 1

This technique is good while fatching single column, if you want more column to fetch you need to modify it like…

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