r in nutshell

)When using the new array, the first parameter type is different, resulting in a ambiguitynew Array(‘hello‘) 和 [‘hello‘] 等价[1] 和 new Array(1) 不等价，前者创建包含元素的1的数组，后则创建长度为1的数组。Therefore, the literal is preferred, because the array literal has more canonical, more consistent semantics.No.53, keeping a consistent agreementTips: Using a consistent convention in variable naming and function signing Do not deviate from the conventions that users are likely to encounter in their development p

enter the URL, they usually enter HTTP://WWW.ABC.COM/ABC.When the Web server receives a URL request that does not contain a slash at the end, such as "HTTP://WWW.ABC.COM/ABC", then the server searches for a file that has the name "abc" in the root directory of the Web site, and if not, the ABC is treated as a directory. Then return to the default home page under the ABC directory. When the Web server receives a request with a slash at the end, it is treated directly as a directory.This is an ar

compiled, it is found that the breathe () function of the animal class is a virtual function, and C + + will use the late binding (late binding) technique. That is, when the compiler does not determine the function of the specific call, but at run time, depending on the type of object (in the program, we pass the address of the Fish class object) to confirm which function is called, this ability is called C + + polymorphism. When we did not add the virtual keyword before the breathe () function

The height of the jquery () and the height of the JavaScript summary, JS get screen HeightsIn JavaScript and jquery, there are various heights of writing, here, we focus on the window, document and other high understanding. (width and height are similar!) )The various heights of jqueryFirst, say $ (document) and $ (window), as follows:$ (document). Height (); // the height of the entire page (window). Height (); // the height of the browser visual window $ (window). scrolltop (); // the height o

Original address: Http://code.angularjs.org/1.0.2/docs/guide/diFirst, Dependency injection (Dependency injection)Dependency Injection (DI) is a software design pattern that handles how code obtains the resources it relies on.For a deeper discussion of Di, you can visit Dependency injection (http://en.wikipedia.org/wiki/Dependency_injection), inversion of Control (http ://martinfowler.com/articles/injection.html), you can also visit the Software design mode book.1. Di in a

The decorator decorator, as the name implies, is dynamically adding some extra responsibilities to an object, just like decorating a house. Therefore, the adorner pattern has the following characteristics:It must have an ornamental object.It must have the same interface as the object being decorated.It can add extra functionality to the object being decorated.In a nutshell: Keep the interface, enhance performance.Adorners extend their functionality by

From CSDN: This article introduces the principle of Java memory allocation in detail to help beginners learn Java more easily. There are many such articles online, but most of them are rather fragmented. From the cognitive process point of view, this paper will bring the reader a systematic introduction.The first thing to know before you get to the point is that the Java program runs on the JVM (Java Virtual Machine,java VM), which can be understood as a bridge between Java programs and operatin

dynamic run-time Momin wonderfully takes what type of object to judge, computes a Boolean value.Groovy designers dig holes for Java programmers:1. The = = in Groovy is equal to the Equals () method in Java, and = = in Java is used to determine if the reference is the same, and in groovy it corresponds to the IS () method2, Java code if the variable name is it such groovy keyword, will be error.In a nutshell, groovy has a very similar syntax to Java,

this video. The content includes 30, and I've seen it 3 times in total.However, for beginners I do not recommend the use of "thinking in Java", I would recommend Prentice Hall PTR "core Java 2" in the domestic known as "Java 2 core technology", is currently the seventh edition. Everyone on the Web can download it to the electronic version. OReilly's "Java In a Nutshell" is also a good choice. After reading these two books, you can take a look at the

function can be called multiple times. When a constructor is defined, it is defined in the constructor when the object is analyzed and the object has some characteristics or behavior. Construct code block: format {...}, which exists in the class. The purpose of this is to initialize the object. The object runs as soon as it is established, and takes precedence over other constructor functions. The difference is that building blocks of code is used to initialize all objects uniformly, an

Collection Framework (Collections framework)First, make it clear that the collection represents a set of objects (and arrays, but the array length cannot change, and the collection Can). The collection framework in Java defines a set of specifications for representing, manipulating, and decoupling specific operations from implementation details.In fact, you can think of a set as a micro-database, operation is nothing more than "delete and change" four kinds of operations, we learn to use a speci

in a nutshell. 1. malloc and free are C++/C standard library functions, and New/delete are C + + operators that can be used to request dynamic memory and release memory. 2, for non-internal data types of objects, only with Malloc/free can not meet the requirements of dynamic objects. When an object is created, the constructor is automatically executed, and the object executes the destructor automatically before it dies. The task of executing c

associated with database data, become a pure memory vo, it even into theinto a new PM, nor can it restore its state.Hibernate is a strong place, after a PO out of session, but also to maintain the state, and then enter a new session, the ability to restore state management, but at this time the state managementNeed to use session.update or session.saveorupdate, this is the "requires a slightly different programming" mentioned in Hibernate referenceModel "Now formally enter this topic:In a

, this kind of long diameter is relatively rareIn a nutshell, this is part of the most manageable phase of a developer's process of loading the class.VerifyThe first step in the connection phase is to ensure that the information contained in the byte stream of the. class file conforms to the requirements of the current virtual machine and does not compromise the security of the virtual machine itself .The Java language itself is a relatively safe lan

Java Garbage Collection OverviewJava GC (Garbage Collection, garbage collection, garbage collector) mechanism, is one of the main differences between Java and C++/C, as a Java developer, generally do not need to specifically write memory recycling and garbage cleanup code, memory leaks and overflow problems, Nor does it need to be as jittery as C programmers. This is because there is an automatic memory management and garbage cleanup mechanism in the Java Virtual machine. In a

talking casually, we are not going to use dogma to tell, but focus on helping developers understand whether they should choose to use and how to use them.What is JSONIn a nutshell, JSON is a text-based data exchange, or a data description format, and you should choose whether or not he should first focus on the advantages it has.The advantages of JSON:1, based on plain text, cross-platform transmission is extremely simple;2, JavaScript native support

a nutshell, this is part of the most manageable phase of a developer's process of loading the class.VerifyThe first step in the connection phase is to ensure that the information contained in the byte stream of the. class file conforms to the requirements of the current virtual machine and does not compromise the security of the virtual machine itself .The Java language itself is a relatively safe language (as opposed to C + +), but as mentioned earl

There are not many ruby books. I have collected these books from the Internet. Download them and click images. Programming Ruby, Second Edition: getting started with ruby, Version 2, required for learning ruby (UPDATED) Agile Web Development with Rails: Version 2 beta. Based on rails1.2 (UPDATED) The Ruby Way is now UPDATED to The second version of ruby 1.8.4, which is shared by bd7lx, thanks Ruby in A NutS