By Stoyan Stefanov
What's the easiest technique for constructing an program with JavaScript? This e-book is helping you solution that query with a number of JavaScript coding styles and most sensible practices. If you're an skilled developer seeking to resolve difficulties relating to items, capabilities, inheritance, and different language-specific different types, the abstractions and code templates during this consultant are excellent -- no matter if you're writing a client-side, server-side, or computer program with JavaScript.
Written via JavaScript professional Stoyan Stefanov -- Senior Yahoo! Technical and architect of YSlow 2.0, the internet web page functionality optimization instrument -- JavaScript Patterns contains sensible recommendation for enforcing each one development mentioned, in addition to numerous hands-on examples. You'll additionally find out about anti-patterns: universal programming techniques that reason extra difficulties than they solve.
* discover necessary behavior for writing high quality JavaScript code, comparable to keeping off globals, utilizing unmarried var declarations, and extra
* examine why literal notation styles are easier choices to features
* detect other ways to outline a functionality in JavaScript
* Create gadgets that transcend the fundamental styles of utilizing item literals and capabilities
* research the choices on hand for code reuse and inheritance in JavaScript
* learn pattern JavaScript methods to universal layout styles resembling Singleton, manufacturing unit, Decorator, and extra
* research styles that observe in particular to the client-side browser setting
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Example text
Downcast) the value, as in int iVar = (int)1234567L;. Be careful with that, because you might lose precision when downcasting floating point numbers! You can assign objects to variables of other types, but only if the type of the variable is a superclass of the class from which you instantiated the object. Similarly to the downcasting of numeric types, you can typecast a value of a superclass into a variable of a subclass type. Comparison operators are straightforward when applied to primitive data types.
The only piece of the puzzle that you still need is how to make the MyLog class. This is also simple: • Open the folder %CATALINA_HOME%\webapps\ROOT\WEB-INF\. • If WEB-INF has no subfolder named classes (it shouldn’t, if you have a fresh installation of Tomcat), create one. java shown in Listing 2-6. java. • Restart Tomcat. 29 CHAPTER 2 JSP ELEMENTS Listing 2-6. java opens your log file in append mode and adds the date and time to your entry before writing it into the file. Notice that the methods are synchronized, so that several pages can log entries at the same time without them getting mixed up.
In the next sections, I will first go through the scripting elements, because they are easier to understand and you can use them to glue together the rest. Then, I will describe the implicit objects and the directives. , request object – authentication). 1 Every Java executable—whether it’s a free-standing program running directly within a runtime environment, an applet executing inside a browser, or a servlet executing in a container such as Tomcat—boils down to instantiating classes into objects and executing their methods.