Javascript Tutorials

History and evolution of Javascript

  • 2008-08-15
  • Comments
  • Nicholas C. Zakas
  • 922

Around 1992, a company called Nombas began developing an embedded scripting language called C-minus-minus (Cmm for short). The idea behind Cmm was simple: a scripting language powerful enough to replace macros, but still similar enough to C (and C++) that developers could learn it quickly. This scripting language was packaged in a shareware product called CEnvi, which first exposed the power of such languages to developers. Nombas eventually changed the name Cmm to ScriptEase because the latter sounded “too negative” and the letter C “frightened people” (http://www.nombas.com/us/scripting/history.htm). ScriptEase is now the driving force behind Nombas products. When the popularity of Netscape Navigator started peaking, Nombas developed a version of CEnvi that could be embedded into Web pages. These early experiments were called Espresso Pages, and they represented the first client-side scripting language used on the World Wide Web. Little did Nombas know that its ideas would become an important foundation for the Internet.
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Javascript Basics

  • 2008-08-15
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  • Nicholas C. Zakas
  • 922

ECMAScript is the standard that set the basics of Javascript syntax. Developers familiar with languages such as Java, C, and Perl will find ECMAScript syntax easy to pick up because it borrows syntax from each. Java and ECMAScript have several key syntax features in common, as well as some that are completely different.
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List of Keywords and reverved words in Javascript

  • 2008-08-15
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  • Emiley J.
  • 922

By rule, keywords are reserved and cannot be used as variable or function names. Here is the complete list of JavaScript keywords.
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Using toString() in JavaScript to convert data types to String

  • 2008-08-15
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  • Nicholas C. Zakas
  • 922

The interesting thing about JavaScript primitive values for Booleans, numbers, and strings is that they are pseudo-objects, meaning that they actually have properties and methods. For example, to get the length of a string, you can do the following:
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Using parseInt() and parseFloat() in JavaScript to convert data types to Numbers

  • 2008-08-15
  • Comments
  • Nicholas C. Zakas
  • 922

JavaScript provides two methods for converting non-number primitives into numbers: parseInt() and parseFloat(). As you may have guessed, the former converts a value into an integer whereas the latter converts a value into a floating-point number. These methods only work properly when called on strings; all other types return NaN.
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Typecasting in Javascript

  • 2008-08-15
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  • Emiley J.
  • 923

It’s also possible to convert values using a process called type casting. Type casting allows you to access a specific value as if it were of a different type. Three type casts are available in JavaScript: Type casting is very helpful when dealing with the loosely typed nature of JavaScript, although you should ensure that only proper values are used
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Bitwise NOT, AND, OR, XOR operators in Javascript

  • 2008-08-15
  • Comments
  • Syed Fazal
  • 922

The bitwise NOT is represented by a tilde (~) and is one of just a few ECMAScript operators related to binary mathematics. The bitwise NOT is a three-step process:
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Using ! and !! in Javascript

  • 2008-08-15
  • Comments
  • Syed Fazal
  • 922

The logical NOT operator in JavaScript is the same as in C and Java, indicated by an exclamation point (!). Unlike logical OR and logical AND operators, the logical NOT always returns a Boolean value.
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Using && in Javascript

  • 2008-08-16
  • Comments
  • Syed Fazal
  • 922

The logical AND operator in JavaScript is indicated by the double ampersand (&&):
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The if statement in Javascript

  • 2008-08-16
  • Comments
  • Syed Fazal
  • 923

One of the most frequently used statements in JavaScript (and indeed, in many languages), is the if statement. The if statement has the following syntax:
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do-while, while, for and for-in loops in Javascript

  • 2008-08-16
  • Comments
  • Syed Fazal
  • 923

Iterative statements, also called loop statements, specify certain commands to be executed repeatedly until some condition is met. The loops are often used to iterate the values of an array (hence the name) or to work though repetitious mathematical tasks. JavaScript provides four types of iterative statements to aid in the process.
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break and continue in Javascript

  • 2008-08-16
  • Comments
  • Syed Fazal
  • 922

The break and continue statements provide stricter control over the execution of code in a loop. The break statement exits the loop immediately, preventing any further repetition of the code while the continue statement exits the current repetition. It does, however, allow further repetition based on the control expression.
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switch in Javascript

  • 2008-08-16
  • Comments
  • Syed Fazal
  • 922

The cousin of the if statement, the switch statement, allows a developer to provide a series of cases for an expression. The syntax for the switch statement is:
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Related Tutorials

Use WinSCP to transfer log files remotely using Javascript

Verifying user input in JavaScript

Pause execution in JavaScript

Javascript to display client date and time on webpage

Getting Browser's height and width using Javascript

Highlighting text on a page using CSS

Using revealTrans to do page transitions in Javascript

Password protect a web page using Javascript

Diabling Right Click option in a browser using Javascript

Scrolling message on the status bar using Javascript

window.frames[i] in Javascript

Form validation using Javascript

Using && in Javascript

The if statement in Javascript

do-while, while, for and for-in loops in Javascript

Archived Comments

1. it was so nice .................i can easily solve
View Tutorial          By: pravin at 2012-07-14 06:15:33

2. 29. It is not a deadlock. What will actually happe
View Tutorial          By: Sasha at 2012-01-24 14:34:03

3. Sat Apr 23 10:44:14 IST 2011:Sender:*** time out a
View Tutorial          By: sasivarnan at 2011-04-23 01:17:18

4. i searched a lot of sites but found the answer her
View Tutorial          By: ALIEN ATTACK at 2012-01-09 09:39:36

5. I need some help. I am a programmer - but quite n
View Tutorial          By: Ron at 2013-06-21 00:58:27

6. please explain importance of java and explain it's
View Tutorial          By: sandhi.vijayanth reddy at 2012-10-01 16:30:54

7. Hi Jgan,
Its very useful ad nice article .

View Tutorial          By: pramod at 2012-01-16 13:21:35

8. Write a times table programme. The programme shoul
View Tutorial          By: Hannah Jambalos at 2014-09-03 12:07:34

9. Good and optimum introduction to J2ME application
View Tutorial          By: [email protected] at 2013-01-14 10:37:57

10. please give example code with defined variable.
View Tutorial          By: shajjad at 2011-02-13 20:56:09