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[Golong] Study Notes (1) Basic knowledge, golong Study NotesBasic Go programming: few built-in keywords (25) Break default func interface selectCase defer go map structChan else goto package switchConst fallthrough if range typeContinute for import return varGo annotation method (same as js) Single line comment ://Multi-line comment :/**/The general structure of the Go program is common_structure.go. Pass

JavaScript advanced programming (Third edition) Study Notes Chapter 6 and Chapter 7, javascript Study Notes Chapter 2 Object-Oriented Programming Object: 1. Data attributes Optional retriable, which indicates whether the attribute can be deleted through delete to redefine the attribute, whether the attribute can be modified, or whether the attribute can be modified to the accessors attribute. The default va

[Oc Study Notes] unchangeable array, oc Study Notes 　　　　 NSArray * aa = [[NSArray alloc] init]; NSArray * aaa = [NSArray array]; // declare a single content array NSArray * aaaa = [NSArray arrayWithObject: @ "sd"]; // declare multiple Content arrays NSArray * arr = [NSArray arrayWithObjects: @ "SDS", @ "Dsad", nil]; // NSLog (@ "% zi", arr. count); // The NSLog object corresponding to a subscript in the arr

Python Study Notes 3-strings, python Study Notes 3- Format String/compound field name >>> import humansize>>> si_suffixes = humansize.SUFFIXES[1000]>>> si_suffixes['KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB']>>> '1000{0[0]} = 1{0[1]}'.format(si_suffixes)'1000KB = 1MB' >>> import humansize>>> import sys>>> '1MB = 1000{0.modules[humansize].SUFFIXES[1000][0]}'.format(sys)'1MB = 1000KB' Sys. modules is a d

Ruby Study Notes 1: Ruby Study Notes Notes: Ruby returns the last value in the method by default.To return multiple values, you can use an array.You can return a value by forcibly declaring return.The basic output method is to use puts (output line) and print (print directly ).The Basic Input Method is gets (read a row that contains '\ n' at the end of the row, which can be eliminated by chomp ).The pure ph

Preliminary Study on WCF-20: WCF error protocol, Preliminary Study on wcf-20 ProtocolWCFError agreements Overview In all hosted applications, error handling is represented by an Exception object. In SOAP-based applications (such as WCF applications), service methods use SOAP error messages to transmit and process error messages. A soap error is a message type included in the service operation metadata. T

Python string formatting study notes, python Study Notes In python, the % operator is used to format the output string. The common format is • Mark the string % value group to be output in the formatThe "format mark string" on the Left can be exactly the same as that in c. If there are two or more values in the 'value Group' on the right, they must be enclosed in parentheses and separated by short signs. Fo

Java gui programming Overview Study Notes (22), gui Study Notes The following content is my study notes on the java video tutorial of Miss Bi Xiangdong! Java gui programming:Windows provides two methods:1. GUI2. CLI;GUI: Grahi User Interface, graphical User Interface.Features: displays the computer operation interface in graphical mode, which is more convenien

Mysql Study Notes (1), mysql Study Notes I have recently encountered some problems in learning MySQL databases, some of which have been solved, and some have not yet found the answer. This article will be used as a study note, and some of the unsolved questions will be supplemented with answers later, please give me some advice when you pass; Problem 1: the Java

1. Summary of this week's study 1.1 Object-oriented learning to be over, use mind map to draw a mind map with encapsulation, inheritance, polymorphism as the core concept, and summarize the object-oriented thought.Note 1: Keywords and content do not ask for much, but the relationship between the concept of clear, content coverage to the core content of the object can be.NOTE 2: Less color, not complicated wiring, when necessary to be on the l

Yii2 in-depth study--inheritance relationship, Yii2 deep learning-- If you want to understand Yii2, be sure to understand the inheritance relationship of YII2 to related classes. Due to the limited amount of code that is temporarily read, only a partial inheritance is listed in the following figure, and then the source reads more and more and then increases You can see that most of the classes in Yii2 inherit from Yii\base\object, which implements t

Mongodb Study Notes 02 and mongodb Study NotesMongodb Study Notes 02-CURD operations CURD indicates Create, Update, Read, and Delete operations. Create a database Directly use the database name and create a collection to create a database. Create collecion db.createCollection("collectionName") Create collection implicitly db.collectionName.insert({xxxxxx})

[Web Development Study Notes] Structs2 Result Study Notes (1) Brief IntroductionStructs2 Result Study Notes (1) Brief Introduction Question 1 Dispatcher-forward uses the server to jump to the server and display the action Redirect-redirect to jsp Chain server jumpRedirectAction Question 2 chain jump-> jump from an action to another action in the package: The ex