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Lesson Posted on 13 Feb IT Courses/Java Script Training Tuition/BTech Tuition/Software Architecture Tuition/BCA Tuition/Software Engineering +3 Tuition/BSc Tuition/Software Engineering Tuition/BA Tuition/Software Engineering IT Courses less

What Is Mean Stack? Why Mean Stack Is Popular Now?

Shibaji D.

I am a working professional in an IT company as a Software Application Architect. I worked at various...

Mean Stack is standing for MongoDB, ExpressJS, AngularJS and NodeJS. These four javascript solutions create a high performing web application. Mainly JavaScript is the frontend language. It’s working with HTML, CSS. But now JavaScript also working on Server Side. But JavaScript not working in... read more

Mean Stack is standing for  MongoDB, ExpressJS, AngularJS and NodeJS. These four javascript solutions create a high performing web application. Mainly JavaScript is the frontend language. It’s working with HTML, CSS. But now JavaScript also working on Server Side. But JavaScript not working in server-side directly. NodeJS creates the javascript compilation environments. NodeJS coding structures are some time complex for the traditional coder who has to know about C, C++, Java, PHP, etc.

NodeJS APIs are executed with C language. Most of the NodeJS Coding structure written by Asynchronize design pattern. Through NodeJS, you can be developed desktop/mobile apps also. This is so much powerful platform for the software developers. Once you can understand about JavaScript and NodeJS, then you can be developed all type of application using this.

AngularJS is most well-known technology.  Most of the software developer knows about it. AngularJS is the frontend JS framework. It’s enhanced the coding pattern for the UI developers. There have so many concepts have for the developer. Like Directives, Scopes, Services, Factory, Promises, configuration etc. If you want to learn about more the follow my blog’s articles.

ExpressJS is the server side development framework. If you wanted to create a web application then you need to be using ExpressJS. ExpressJS can be handle website pages, routeing, controllers, model etc. Fullstack website development supports will be getting from it.

MongoDB is the JavaScript-based database. It’s developed for BigDB. NoSQL query language is using here. This database is the perfect match for Mean Stack development. We can easily store picture and movie data with bytecode. This database working performance the better from another database. Here has lots of memory management/optimisation process.

If you are wanted to discover as a software. Then you can be learning about Mean Stack. Mean is sometimes easy to learning. If you will get proper guideline for study. Most of the newcomers are confused about the development process. Which  Programming language will help me grow up my knowledge as a software developer. For this process, you need to learn about HTML, CSS, JavaScript, and JavaScript worked frontend/client side as well as it works as server end also. Every type of knowledgeable people/developer can develop their desire software with this knowledge.

Mean Stack learning process too much easy. But most of the time new developers/learner cannot understand how to study this process.  The main problem is distributed documentation for Mean Stack. And another problem is there have so many procedures to develop your software using Mean Stack software.

Sometimes some people ask me how to published my Mean stack software. What is the best server for using this type of application?

Mean Stack software too much easy to distribution process at this moments. But you wanted to serve your application online, then you needed cloud server. I will suggest digital ocean best of for every type of developers. Also, you can sign up with this link and you get $10 after confirmation of your account.

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Lesson Posted on 13 Feb IT Courses/Angular.JS IT Courses/Java Script Training IT Courses +2 IT Courses/Website Scripting IT Courses/Static Websites less

Angular 1 vs Angular 2

Shibaji D.

I am a working professional in an IT company as a Software Application Architect. I worked at various...

Angular team has released the angular 2, which has drastically change the way programmers interact and work with Angular framework in the past. In this post I will tell you the common changes made by the team in the current release. The primary goal of latest Angular 2 is to create an easier and more... read more

Angular 1 vs Angular 2

Angular team has released the angular 2, which has drastically change the way programmers interact and work with Angular framework in the past. In this post I will tell you the common changes made by the team in the current release. The primary goal of latest Angular 2  is to create an easier and more powerful web framework. Angular 2 is initially made with TypeScript, but this will be compatible with all latest JavaScript standards like ES5 and ES6 and Dart-lang.

New Component-Based Architecture

Angular 2 is based on component based architecture. Old Controllers and $scope systems is replaced with components and directives. Now controllers and directives are most important part of AngularJS based applications. Components work with selectors. A component has a selector and associated html tag to represent it.

Differences of Representation in Angular 1 and Angular 2:

Angular 1.x:

angular.module(‘myApp’,[])
.controller(‘TestCtrl”, function() {
});

 

Angular 2.0:
import {Component, View} from 'angular2/angular2';
@Component({
 
selector: 'my-view'
 
});

 

 

At bootstrap we have to declare components before we start working with them. These components have to be imported on the page where these are used.

Input with the Event Syntax:

Angular 2 makes events processing more simplified.  Now applications can respond to input as an event too. You can deal with input like an event. The event syntax is simple as now you can denote events within parenthesis.

Differences of User Input handling syntax in Angular 1 and Angular 2:

Angular 1.x:

 
 

Angular 2.0:

 
 

Better Performance:

Angular 2 is both faster and more memory efficient than Angular 1 this is done with the help of immutable data structures. Another reason for improved performance is introduction of uni-directional data flow. There is no direct way to implement two way data flow in angular 2 . This concept is in fact implemented in an entirely different way in Angular 2. You can use export syntax to do the same.

Data flow in Angular 2:

@View({
templateUrl: './components/example/example.html'
})

export class Example {} 
 

No $scope in Angular 2:

Although $scope variable was an important part of angular 1 but it is deprecated in angular 2.

But the main thing to consideration is even ‘$scope’ is deprecated it is in fact is replaced by “controller”. In angular 2 properties are bound to components itself to work in applications.

Angular 2 is more transparent due to Zones:

Angular 2 uses the zones mechanism. This ensures that old digest cycle is not necessary in the new environment. Angular 2 digest, if triggered by a component that is inside a zone:

Directives:

With a clean Directive annotation you can declare a directive in application. Directives can be used in components.

Improved Dependency Injection:

Angular 2 has a better and improved dependency injection system. There are much more opportunities for components based applications.

There are certain benefits other benefits of AngularJS. Element references can also be available to other parts of the template. Angular team has taken a  nice step to launch angular 2.

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Lesson Posted on 07 Feb IT Courses/Java IT Courses/Java Script Training Tuition/BCA Tuition/Java Programming +3 Tuition/BTech Tuition/Java Programming Tuition/Engineering Diploma Tuition/Java Programming IT Courses/Java/Core Java less

Java Interview Questions & Answers

Dev Group

Dev Group provides an in-depth IT & accounts training in Delhi. All the courses and training classes...

Java Interview Questions have been designed especially to get you acquainted with the nature of questions you may encounter during your interview for the subject of Java Programming Language. As per my experience, good interviewers hardly planned to ask any particular question during your interview,... read more

Java Interview Questions have been designed especially to get you acquainted with the nature of questions you may encounter during your interview for the subject of Java Programming Language. As per my experience, good interviewers hardly planned to ask any particular question during your interview, normally questions start with some basic concept of the subject and later they continue based on further discussion and what you answer.

Q 1. What do you know about Java?

Ans. Java is a high-level programming language originally developed by Sun Microsystems and released in 1995. Java runs on a variety of platforms, such as Windows, Mac OS, and the various versions of UNIX.

Q 2. What are the supported platforms by Java Programming Language?

Ans. Java runs on a variety of platforms, such as Windows, Mac OS, and the various versions of UNIX/Linux like HP-Unix, Sun Solaris, Redhat Linux, Ubuntu, CentOS, etc.

Ans. Some features include Object Oriented, Platform Independent, Robust, Interpreted, Multi-threaded.

Ans. It’s compiler generates an architecture-neutral object file format, which makes the compiled code to be executable on many processors, with the presence of Java runtime system.

Ans. Java uses Just-In-Time compiler to enable high performance. Just-In-Time compiler is a program that turns Java bytecode, which is a program that contains instructions that must be interpreted into instructions that can be sent directly to the processor.

Ans. It is designed to adapt to an evolving environment. Java programs can carry extensive amount of run-time information that can be used to verify and resolve accesses to objects on run-time.

Ans. When Java is compiled, it is not compiled into platform specific machine, rather into platform independent byte code. This byte code is distributed over the web and interpreted by virtual Machine (JVM) on whichever platform it is being run.
Q 8. List two Java IDE’s.

Ans. Netbeans, Eclipse, etc.

Q.9. List some Java keywords(unlike C, C++ keywords).

Ans. Some Java keywords are import, super, finally, etc.

Ans. Object is a runtime entity and it’s state is stored in fields and behavior is shown via methods. Methods operate on an object's internal state and serve as the primary mechanism for object-to-object communication.

Q11. Define class.

Ans. A class is a blue print from which individual objects are created. A class can contain fields and methods to describe the behavior of an object.

Ans. A class consist of Local variable, instance variables and class variables.

Ans. Variables defined inside methods, constructors or blocks are called local variables. The variable will be declared and initialized within the method and it will be destroyed when the method has completed.

Ans. Instance variables are variables within a class but outside any method. These variables are instantiated when the class is loaded.

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Lesson Posted on 01 Feb IT Courses/Java Script Training

Beginner JavaScript

Jagadish Kumar

I am a Software Professional with 15 + years in Software Development. I teach the fundamentals of web...

1. Javascript is a programming language that adds interactivity to your website. 2. JavaScript is a programming language that allows you to implement complex things on web pages. 3. Javascript is primarily used as a client-side scripting language .i.e it runs on our browser. 4. Java simple,... read more

1. Javascript is a programming language that adds interactivity to your website.

 

2. JavaScript is a programming language that allows you to implement complex things on web pages.

 

3. Javascript is primarily used as a client-side scripting language .i.e it runs on our browser.

 

4. Java simple, easy to understand with advanced features.

 

5. JavaScript 2.0 conforms to Edition 5 of the ECMAScript standard.

 

6. Javascript is fundamental for learning popular front-end frameworks and  libraries.

 

Front-end of the web application :

  • HTML is the markup language that we use to structure and give meaning to our web content, for example defining paragraphs, headings, and data tables, or embedding images and videos in the page.
  • CSS is a language of style rules that we use to apply styling to our HTML content, for example setting background colors and fonts, and laying out our content in multiple columns.
  • JavaScript is a scripting language that enables you to create dynamically updating content, control multimedia, animate images, and pretty much everything else. (Okay, not everything, but it is amazing what you can achieve with a few lines of JavaScript code.)

Language Fundamentals :

 

1. Variables: A variable can be declared with a keyword var.

  • var number1 = 1000;
  • var myname = "Asha" ;
  • Here we have declared variables and assigned values to them.
  • Strings are double or single quoted.
  • Variables declared outside function has global scope and is called Global variables.
  • Variables declared inside function has local scope and is called local variables. 
  • Variables names can start with alphabets or  _ .
  • Names cannot start with numbers. 
  • They are case sensitive.

JavaScript Variable c five data types

1. String

2. Number

3.Object

4.Boolean

5.Array

6. Object

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Lesson Posted on 17/11/2017 IT Courses/Java Script Training

String Comparison In Javascript

Guna

The JavaScript language Here we learn JavaScript, starting from scratch and go on to advanced concepts...

String Comparison in javascript: Let us learn how two strings are compared in javascript Assume you have two strings: "ant" and "ele" Case 1: alert("ant" < "ele" ); will give the result as true meaning "ant" is smaller than "ele". Because the first characters in string "ant" is "a" and in "ele"... read more

String Comparison in javascript:

Let us learn how two strings are compared in javascript

Assume you have two strings:

"ant" and "ele"

Case 1:

alert("ant" < "ele" ); will give the result as true meaning "ant" is smaller than "ele". Because the first characters in string "ant" is "a" and in "ele" "e". "a" is considered small because "a" comes before "e". This makes the string "ant" smaller than "ele".

Case 2:

"ant" and "Ant"

alert("ant" < "Ant"); will give the result as false meaning "Ant" is smaller than "ant".

"A" is smaller than "a" it is because of unicode values that are used to represent character in computer.
a ---------> 97
A --------->65

Case 3:

"ant" and "ant"

alert("ant" < "ant" ); will give the result as false because they are equal if first characters are equal, compare the second characters the same way. Continue until the end of any string. If both strings ended simultaneously then they are equal,
here it is found to be same till the end so they are equal.

Case 4:

"ant" and "ants"

alert("ant" < "ants"); will give the result as true because if first characters are equal, compare the second characters the same way. Continue until the end of any string. If both strings do not end simultaneously the longer string is greater.

Summary:

  • Check the first characters of both strings.
  • If the first string has the first character as greater or less, then the first string is greater (or less) than the second. We are done.
  • If first characters are equal, compare the second characters the same way continue until the end of any string
  • If both strings ended simultaneously, then they are equal. Otherwise the longer string is greater.
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Lesson Posted on 25/09/2017 IT Courses/Angular.JS IT Courses/Java Script Training

NgModules vs. JavaScript modules (Angular 2)

Ranjan Panda

I am .Net Trainer with more than 6 years Industry experience in Microsoft .net technologies, Expertise...

The NgModule — a class decorated with @NgModule Decorator — is a fundamental feature of Angular. JavaScript also has its own module system for managing collections of JavaScript objects. It's completely different and unrelated to the NgModule system. In JavaScript each file is a module... read more

The NgModule — a class decorated with @NgModule Decorator — is a fundamental feature of Angular.

JavaScript also has its own module system for managing collections of JavaScript objects. It's completely different and unrelated to the NgModule system.

In JavaScript each file is a module and all objects defined in the file belong to that module. The module declares some objects to be public by marking them with the export key word. Other JavaScript modules use import statements to access public objects from other modules.

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Lesson Posted on 25/09/2017 IT Courses/Angular.JS IT Courses/Java Script Training IT Courses/jQuery +2 .Net .Net/.Net MVC less

Dependency Injection in Angular 2

Ranjan Panda

I am .Net Trainer with more than 6 years Industry experience in Microsoft .net technologies, Expertise...

Dependency injection Dependency injection is a way to supply a new instance of a class with the fully-formed dependencies it requires. Most dependencies are services. Angular uses dependency injection to provide new components with the services they need. Angular can tell which services a component... read more

Dependency injection

Service

Dependency injection is a way to supply a new instance of a class with the fully-formed dependencies it requires. Most dependencies are services. Angular uses dependency injection to provide new components with the services they need.

Angular can tell which services a component needs by looking at the types of its constructor parameters. For example, the constructor of your HeroListComponent needs a HeroService:

Sample Code-

src/app/hero-list.component.ts (constructor)
constructor(private service: HeroService) { }

When Angular creates a component, it first asks an injector for the services that the component requires.

An injector maintains a container of service instances that it has previously created. If a requested service instance is not in the container, the injector makes one and adds it to the container before returning the service to Angular. When all requested services have been resolved and returned, Angular can call the component's constructor with those services as arguments. This is dependency injection.

The process of HeroService injection looks a bit like this:

Service

If the injector doesn't have a HeroService, how does it know how to make one?

In brief, you must have previously registered a provider of the HeroService with the injector. A provider is something that can create or return a service, typically the service class itself.

You can register providers in modules or in components.

In general, add providers to the root module so that the same instance of a service is available everywhere.

src/app/app.module.ts (module providers)
providers: [
BackendService,
HeroService,
Logger
],

Alternatively, register at a component level in the providers property of the @Component metadata:

src/app/hero-list.component.ts (component providers)
@Component({
  selector:    'hero-list',
  templateUrl: './hero-list.component.html',
  providers:  [ HeroService ]
})

Registering at a component level means you get a new instance of the service with each new instance of that component.

Points to remember about dependency injection:

  • Dependency injection is wired into the Angular framework and used everywhere.

  • The injector is the main mechanism.

    • An injector maintains a container of service instances that it created.
    • An injector can create a new service instance from a provider.
  • provider is a recipe for creating a service.

  • Register providers with injectors.

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Lesson Posted on 25/09/2017 .Net .Net/.Net MVC IT Courses/Angular.JS +2 IT Courses/Programming Languages/C Sharp IT Courses/Java Script Training less

Inversion of Control

Ranjan Panda

I am .Net Trainer with more than 6 years Industry experience in Microsoft .net technologies, Expertise...

Problem You have classes that have dependencies on services or components whose concrete type is specified at design time. In this example, ClassA has dependencies on ServiceA and ServiceB. Figure 1 illustrates this. Figure 1 ClassA has dependencies on ServiceA and ServiceB This situation has the... read more

Problem

You have classes that have dependencies on services or components whose concrete type is specified at design time. In this example, ClassA has dependencies on ServiceA and ServiceB. Figure 1 illustrates this.

Ff921087.35d9aa8f-1568-431b-9d7f-db477ae067dc(en-us,PandP.10).png

Figure 1 
ClassA has dependencies on ServiceA and ServiceB

This situation has the following problems:

  • To replace or update the dependencies, you need to change your classes' source code.
  • The concrete implementations of the dependencies have to be available at compile time.
  • Your classes are difficult to test in isolation because they have direct references to dependencies. This means that these dependencies cannot be replaced with stubs or mocks.
  • Your classes contain repetitive code for creating, locating, and managing their dependencies.

Forces

Any of the following conditions justifies using the solution described in this pattern:

  • You want to decouple your classes from their dependencies so that the dependencies can be replaced or updated with minimal or no changes to your classes' source code.
  • You want to write classes that depend on classes whose concrete implementations are not known at compile time.
  • You want to test your classes in isolation, without using the dependencies.
  • You want to decouple your classes from being responsible for locating and managing the lifetime of dependencies.

Solution

Delegate the function of selecting a concrete implementation type for the classes' dependencies to an external component or source.

Implementation Details

The Inversion of Control pattern can be implemented in several ways. The Dependency Injection pattern and the Service Locator pattern are specialized versions of this pattern that delineate different implementations. Figure 2 illustrates the conceptual view of both patterns.

Ff921087.bbfbea6f-4b25-4d01-8761-770a91838669(en-us,PandP.10).png

Figure2 
Conceptual view of the Service Locator and Dependency Injection patterns

For more information about these patterns, see Dependency Injection and Service Locator.

Examples

The following are example implementations of the Inversion of Control pattern:

  • In the Configuration Modularity QuickStarts, the class ModuleA defined in the ModuleA project uses dependency injection to obtain a reference to the region manager service, as shown in the following code.
     
    public class ModuleA : IModule
    {
        private readonly IRegionManager _regionManager;
    
        public ModuleA(IRegionManager regionManager)
        {
            _regionManager = regionManager;
        }
    
        ...
    }
    
    

    Because the ModuleA class is instantiated by a container and an instance of the region manager service is registered with the container, the ModuleA class receives a valid instance of the region manager service when it is constructed. Note that a mock instance of the region manager service can be supplied when testing the ModuleA class by passing the mock instance in the constructor's parameter.

  • The following code, extracted from the NewsModule class of the Stock Trader Reference Implementation (this class is located at StockTraderRI.Modules.News\NewsModule.cs), shows how an instance that implements the INewsController interface is obtained using the service locator pattern. The variable _container holds an instance to a container that has logic to locate a valid instance of the requested type.
     
    public void Initialize()
    {
        RegisterViewsAndServices();
        INewsController controller = _container.Resolve<INewsController>();
        controller.Run();
    }
    
    

    Note that for testing purposes, you could configure the container to return a mock instance that implements the INewsController interface instead of the real implementation. This enables you to test the NewsModule class in isolation. The following code, extracted from the NewsModuleFixture test class (located in StockTraderRI.Modules.News.Tests\NewsModuleFixture.cs), shows how the NewsModule class can be tested in isolation using a mock instance for the INewsController interface.

     
    [TestMethod]
    public void InitCallsRunOnNewsController()
    {
        MockUnityResolver container = new MockUnityResolver();
        var controller = new MockNewsController();
        container.Bag.Add(typeof(INewsController), controller);
        var newsModule = new NewsModule(container);
    
        newsModule.Initialize();
    
        Assert.IsTrue(controller.RunCalled);
    }
    
    

Liabilities

The Inversion of Control pattern has the following liabilities:

  • You need to implement a mechanism that provides the dependencies that are required by the object that is being initialized.
  • There is added complexity to the source code, which makes it harder to understand.
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Lesson Posted on 25/09/2017 IT Courses/Angular.JS IT Courses/Java Script Training IT Courses/jQuery

Mark And Sweep Algorithm in Javascript Memory Management

Ranjan Panda

I am .Net Trainer with more than 6 years Industry experience in Microsoft .net technologies, Expertise...

This algorithm reduces the definition of "an object is not needed anymore" to "an object is unreachable". This algorithm assumes the knowledge of a set of objects called roots (In JavaScript, the root is the global object). Periodically, the garbage-collector will start from these roots, find all objects... read more

This algorithm reduces the definition of "an object is not needed anymore" to "an object is unreachable".

This algorithm assumes the knowledge of a set of objects called roots (In JavaScript, the root is the global object). Periodically, the garbage-collector will start from these roots, find all objects that are referenced from these roots, then all objects referenced from these, etc. Starting from the roots, the garbage collector will thus find all reachableobjects and collect all non-reachable objects.

This algorithm is better than the previous one since "an object has zero reference" leads to this object being unreachable. The opposite is not true as we have seen with cycles.

As of 2012, all modern browsers ship a mark-and-sweep garbage-collector. All improvements made in the field of JavaScript garbage collection (generational/incremental/concurrent/parallel garbage collection) over the last few years are implementation improvements of this algorithm, but not improvements over the garbage collection algorithm itself nor its reduction of the definition of when "an object is not needed anymore".

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Lesson Posted on 25/09/2017 IT Courses/Java Script Training IT Courses/Angular.JS

Closures in Javascript

Ranjan Panda

I am .Net Trainer with more than 6 years Industry experience in Microsoft .net technologies, Expertise...

A closure is the combination of a function and the lexical environment within which that function was declared. Consider the following example: function makeFunc() { var name = 'Mozilla'; function displayName() { alert(name); } return displayName; } var myFunc = makeFunc(); myFunc(); Running... read more

closure is the combination of a function and the lexical environment within which that function was declared.

Consider the following example:

function makeFunc() {
  var name = 'Mozilla';
  function displayName() {
    alert(name);
  }
  return displayName;
}

var myFunc = makeFunc();
myFunc();

Running this code has exactly the same effect as the previous example of the init()function above; what's different — and interesting — is that the displayName() inner function is returned from the outer function before being executed.

At first glance, it may seem unintuitive that this code still works. In some programming languages, the local variables within a function exist only for the duration of that function's execution. Once makeFunc() has finished executing, you might expect that the name variable would no longer be accessible. However, because the code still works as expected, this is obviously not the case in JavaScript.

The reason is that functions in JavaScript form closures. A closure is the combination of a function and the lexical environment within which that function was declared. This environment consists of any local variables that were in-scope at the time the closure was created. In this case, myFunc is a reference to the instance of the function displayName created when makeFunc is run. The instance of displayNamemaintains a reference to its lexical environment, within which the variable name exists. For this reason, when myFunc is invoked, the variable name remains available for use and "Mozilla" is passed to alert.

Here's a slightly more interesting example — a makeAdder function:

function makeAdder(x) {
  return function(y) {
    return x + y;
  };
}

var add5 = makeAdder(5);
var add10 = makeAdder(10);

console.log(add5(2));  // 7
console.log(add10(2)); // 12

In this example, we have defined a function makeAdder(x), which takes a single argument, x, and returns a new function. The function it returns takes a single argument, y, and returns the sum of x and y.

In essence, makeAdder is a function factory — it creates functions which can add a specific value to their argument. In the above example we use our function factory to create two new functions — one that adds 5 to its argument, and one that adds 10.

add5 and add10 are both closures. They share the same function body definition, but store different lexical environments. In add5's lexical environment, x is 5, while in the lexical environment for add10x is 10.

 

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