Tutorial by Examples: d

To understand Dependency Inversion Principle (DIP) we need to clear concept about Inversion Of Control(IOC) and Dependency Injection(DI). So here we discuss all about the terms with Dependency Inversion Principle (DIP). Inversion Of Control(IOC) : The control or logic which is not the part of t...

A docstring is a multi-line comment used to document modules, classes, functions and methods. It has to be the first statement of the component it describes. def hello(name): """Greet someone. Print a greeting ("Hello") for the person with the given name. &...

All documents from students collection. > db.students.find().pretty(); { "_id" : ObjectId("58f29a694117d1b7af126dca"), "studentNo" : 1, "firstName" : "Prosen", "lastName" : "Ghosh", "age" ...

MongoDB's db.collection.drop() is used to drop a collection from the database. First, check the available collections into your database mydb. > use mydb switched to db mydb > show collections newCollection1 newCollection2 newCollection3 system.indexes Now drop the collection with...

After installation of hazelcast and adding to Java Build Path, you can write Main.class that starts cluster work public static void main(String[] args){ Config config = new Config(); // creates a new HazelcastInstance (a new node in a cluster) HazelcastInstance instance = Hazelcast.n...

MongoClient.connect('mongodb://localhost:27017/myNewDB',function (err,db) { if(err) console.log("Unable to connect DB. Error: " + err) else console.log('Connected to DB'); db.close(); }); myNewDB is DB name, if it does not exists in database then it...

In GraphQL the Schema defines the root execution queries and mutations as well as the types for your data. Schema Object Type The Person type has two fields, one is a standard Scalar type and the other represents a relationship to a list of other Person types that are 'friends'. Linking other type...

<div sec:authorize="isAuthenticated()"> This text is displayed for authenticated users. </div>

/In async.series,all the functions are executed in series and the consolidated outputs of each function is passed to the final callback. e.g/ var async = require('async'); async.series([ function (callback) { console.log('First Execute..'); callback(null, 'userPersonalData'); }, function (cal...

The basic syntax of find() method with projection is as follows > db.COLLECTION_NAME.find({},{KEY:1}); If you want to show all documents without the age field then the command is as follows db.people.find({},{age : 0}); If you want to show all documents the age field then the command is a...

In MongoDB, projection means selecting only the necessary data rather than selecting whole of the data of a document. The basic syntax of find() method with projection is as follows > db.COLLECTION_NAME.find({},{KEY:1}); If you want to to show all document without the age field then the comm...

RDBMSGraph DatabaseTablesGraphsRowsNodesColumns and DataProperties and its valuesConstraintsRelationshipsJoinsTraversal

Creating a basic block Creating a basic item Writing a Hello command Writing an Event Handler Getting started with Capabilities [1.8+]

When using the .get() method whatever is in the entry widget will be converted into a string. For example, regardless of the type of input(It can be a number or sentence), the resulting outcome will be a string. If the user types 4 the output will be "4" as in a string. To get an int from ...

The andThen function allows update call composition. Can be used with the pipeline operator (|>) to chain updates. Example: You are making a document editor, and you want that each modification message you send to your document, you also save it: import Update.Extra exposing (andThen) import U...

public static MvcHtmlString DatePickerFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, object htmlAttributes) { var sb = new StringBuilder(); var metaData = ModelMetadata.FromLambdaExpression(expression, htm...

void C++ When used as a function return type, the void keyword specifies that the function does not return a value. When used for a function's parameter list, void specifies that the function takes no parameters. When used in the declaration of a pointer, void specifies that the pointer is ...

The org.bukkit.event.EventHandler annotation accepts a couple parameters. priority - Indicates the priority of your listener. There are the six different priorities, in order of execution: LOWEST,LOW,NORMAL[default],HIGH,HIGHEST,MONITOR. These constants refer to the org.bukkit.event.EventPriority e...

# It creates vendor folder and vendor.json inside it govendor init # Add dependencies in vendor.json govendor fetch <dependency> # Usage on new repository # fetch depenencies in vendor.json govendor sync Example vendor.json { "comment": "", "ignore&qu...

Using scanf Scanf scans text read from standard input, storing successive space-separated values into successive arguments as determined by the format. It returns the number of items successfully scanned. If that is less than the number of arguments, err will report why. Newlines in the input mus...