Javascript Tutorials

History and evolution of Javascript

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

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

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

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

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

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

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

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

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

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

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

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

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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Most Viewed Articles on Javascript Show how many characters remaining in a html text box using javascript List of Keywords and reverved words in Javascript Typecasting in Javascript History and evolution of Javascript Using && in Javascript Form validation using Javascript Password protect a web page using Javascript Click to remove an element from a select html form using javascript Javascript Basics Using parseInt() and parseFloat() in JavaScript to convert data types to Numbers Bitwise NOT, AND, OR, XOR operators in Javascript Using ! and !! in Javascript The if statement in Javascript do-while, while, for and for-in loops in Javascript break and continue in Javascript

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