1: Programming with JavaScript in VS .NET

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1: Programming with JavaScript
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in your day-to-day development Topics we cover are functions as rstclass objects, primitive data types, objects, equality, variable scope, and function arguments From there, we transition into developing a few objects that act like a classic object-oriented system We cover this because the Microsoft AJAX Library acts like a classic object-oriented system, and it s important to understand the basics of how Microsoft created this system so that we can be prepared for and understand its programming model
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Generally JavaScript
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JavaScript Introduction JavaScript can be separated into two categories: client-side JavaScript (CSJS) and server-side JavaScript (SSJS) SSJS is used infrequently when compared to its client-side sibling Because we re looking at client technologies, when we refer to JavaScript in this book we refer to CSJS JavaScript is actually the Mozilla Foundation implementation of the ECMAScript standard, but the term is more commonly used to refer to all implementations of the ECMAScript standard rather than to the Mozilla Foundation-speci c implementation When we refer to JavaScript in this book, we are referring to the ECMAScript standard, not the Mozilla-speci c implementation Keep in mind, however, that different browsers have implemented the standard in moderately different ways Despite its name, JavaScript is completely unrelated to the Sun Microsystem Java programming language Netscape changed the language name from LiveScript to JavaScript as a co-marketing deal between Netscape and Sun when Java was bundled with the Netscape browser, back when Netscape was the dominate browser In retrospect, it is a horrible name that has been the source of confusion for many developers Language Attributes
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Dynamically Typed
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In dynamically typed languages, the data types are not declared and are not known until execution time This is in contrast to statically typed
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languages, such as C# or Java, where data types are declared and known at compile type Dynamically typed languages can lead to more exible applications when compared to statically typed languages, but developers often prefer the clarity and error checking that declared and compiled data types provide in a statically typed language The example in Listing 11 shows legal statements in JavaScript, a dynamically typed language, which would be illegal in a statically typed language
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Listing 11 Dynamic Typing
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var x = 5; // set x to 5 x = "hello!"; // set x to 'hello!'
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In JavaScript, this is perfectly legal because the type is associated to the value of the variable rather than the variable itself In contrast, this is illegal in a statically typed language because the type is associated to the variable and the compiler wouldn t allow x to change its associated type from an integer to a string
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Interpreted
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Like most scripting languages, JavaScript is interpreted rather than compiled Its code is stored as text and interpreted into machine instructions and stored in memory as the program runs This is in contrast to compiled languages, such as C# and Java, where the code is compiled into machine instructions or an intermediate form such as IL or bytecode in a discrete step before program execution begins
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Functions as First-Class Objects
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In JavaScript, Function is a type of built-in object It has a property that contains executable code and can be invoked using its name followed by parentheses, () The Function object is important because it enables us to group code into a callable block We actually use the Function type unknowingly whenever we declare a new function Whenever the keyword function is used, it actually creates a new object of type Function passing in the function s body to Function s constructor Listing 12 demonstrates this concept The two methods, newMethod and newMethod2, are exactly the same thing (other than their names) once interpreted and executed by the JavaScript runtime
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