**How does the Internet work?**

Great question! The Internet's growth has become explosive and it seems impossible to escape the bombardment of www.com's seen constantly on Social Media. Because the Internet has become such a large part of our lives, a good understanding is needed to use this new tool most effectively.

As Internet is a global network of computers,it is very important that each computer must be uniquely identified.Hence comes the **IP Address**.

IP addresses are in the form nnn.nnn.nnn.nnn where nnn must be a number from 0 - 255.
The picture below illustrates two computers connected to the Internet; your computer with IP address 1.2.3.4 and another computer with IP address 5.6.7.8. The Internet is represented as an abstract object in-between.

![](https://web.stanford.edu/class/msande91si/www-spr04/readings/week1/InternetWhitepaper_files/ruswp_diag1.gif)

As you all must have a Wifi Internet connection at one which in technical terms called an ISP- Internet Service Provider. Everytime you connect to your wifi,your computer is assigned a temporary IP address which uniquely identifies your computer in that network.

**How Computers Talk?**

Computers in a network be it LAN network or Internet Network communicates through a particular set of protocols.

- Application Protocol
- Transmission Protocol
- Internet Protocol
- Hardware Protocol

**Communication Process!**

![](https://web.stanford.edu/class/msande91si/www-spr04/readings/week1/InternetWhitepaper_files/ruswp_diag2.gif)

1.  The message would start at the top of the protocol stack on your computer and work it's way downward.
2.  If the message to be sent is long, each stack layer that the message passes through may break the message up into smaller chunks of data. This is because data sent over the Internet (and most computer networks) are sent in manageable chunks. On the Internet, these chunks of data are known as **packets**.
3.  The packets would go through the Application Layer and continue to the TCP layer. Each packet is assigned a **port number**. Ports will be explained later, but suffice to say that many programs may be using the TCP/IP stack and sending messages. We need to know which program on the destination computer needs to receive the message because it will be listening on a specific port.
4.  After going through the TCP layer, the packets proceed to the IP layer. This is where each packet receives it's destination address, 5.6.7.8.
5.  Now that our message packets have a port number and an IP address, they are ready to be sent over the Internet. The hardware layer takes care of turning our packets containing the alphabetic text of our message into electronic signals and transmitting them over the phone line.
6.  On the other end of the phone line your ISP has a direct connection to the Internet. The ISPs **router** examines the destination address in each packet and determines where to send it. Often, the packet's next stop is another router. More on routers and Internet infrastructure later.
7.  Eventually, the packets reach computer 5.6.7.8. Here, the packets start at the bottom of the destination computer's TCP/IP stack and work upwards.
8.  As the packets go upwards through the stack, all routing data that the sending computer's stack added (such as IP address and port number) is stripped from the packets.
9.  When the data reaches the top of the stack, the packets have been re-assembled into their original form, "Hello computer 5.6.7.8!"

**How Computers Identify each other?**

But what if you don't know the IP address of the computer you want to connect to? What if the you need to access a web server referred to as www.othercomputer.com? How does your web browser know where on the Internet this computer lives? The answer to all these questions is the Domain Name Service or DNS. The DNS is a distributed database which keeps track of computer's names and their corresponding IP addresses on the Internet.
Many computers connected to the Internet host part of the DNS database and the software that allows others to access it. These computers are known as DNS servers. No DNS server contains the entire database; they only contain a subset of it. If a DNS server does not contain the domain name requested by another computer, the DNS server re-directs the requesting computer to another DNS server.

So,DNS is basically a kind of Database that stores all the domain names corresponding to their IP Addresses and whenever you want to connect to suppose 10.8.9.100 then it looks up domain of 10.8.9.100 and connects to corresponding domain of it like www.othercomputer.com.

So,Thats it for the basic introduction of how internet works in general.See you guys in the next one!

How Internet Works Explained in Easy Steps | by devdad

Hello Everyone,devdad This side :)

#### Why We need Binary Search:-

1.  After DP and Graph , Binary Search is one of the most asked interview topic in top product base companies.
2.  In some DP question you need to use Binary Search
3.  Binary Search also usefull in Binary Search Tree Concept

### Topic wise learning of Binary Search:

-   Phase 1 : Normal Queastion like next element, finding ceil or floor, find first or last occurance of a number, LowerBound and UpperBound. (sometimes companies like microsoft don't give you permission to use STL/Collection Framework for lower bound and upper bound)
-   Phase 2 : Update your binary search algorithm in some mathematical questions like ternary search, square root of a num, search element in a infinite array, find peak element, search in matrix.
-   Phase 3 : Circular array type questions like Find min element in a ciculary sorted array, find number of rotate a sorted array elements, search in rotate and sorted array, search in a nearly sorted array, Minimum difference element in an sorted array.
-   Phase 4 : Biotonic array related questions max eleemnt in a biotonic array, search element in biotonic array.
-   Phase 5 : where you need to master in Binary Search, for that do some tricky questions- Magnetic Force Between Two Balls, Minimum Limit of Balls in a Bag, Minimized Maximum of Products Distributed to Any Store , Capacity To Ship Packages Within D Days, Maximum Candies Allocated to K Children .

### Quality Questions Step by Step practice:-

Easy:-\
<https://leetcode.com/problems/sqrtx/>\
<https://leetcode.com/problems/binary-search/>\
<https://leetcode.com/problems/count-negative-numbers-in-a-sorted-matrix/>\
<https://leetcode.com/problems/peak-index-in-a-mountain-array/>

Medium:-\
<https://leetcode.com/problems/time-based-key-value-store/>\
<https://leetcode.com/problems/search-in-rotated-sorted-array/>\
<https://leetcode.com/problems/powx-n/>\
<https://leetcode.com/problems/find-first-and-last-position-of-element-in-sorted-array/>\
<https://leetcode.com/problems/find-peak-element/>\
<https://leetcode.com/problems/search-a-2d-matrix/>\
<https://leetcode.com/problems/divide-two-integers/>\
<https://leetcode.com/problems/capacity-to-ship-packages-within-d-days/>\
<https://leetcode.com/problems/minimum-limit-of-balls-in-a-bag/>

Hard:-\
<https://leetcode.com/problems/median-of-two-sorted-arrays/>\
<https://leetcode.com/problems/count-of-smaller-numbers-after-self/>\
<https://leetcode.com/problems/max-sum-of-rectangle-no-larger-than-k/>\
<https://leetcode.com/problems/split-array-largest-sum/>\
<https://leetcode.com/problems/shortest-subarray-with-sum-at-least-k/>

Youtube Videos Recommendation :

1.  <https://youtube.com/playlist?list=PL_z_8CaSLPWeYfhtuKHj-9MpYb6XQJ_f2> [Aditya Verma, Language- Hindi]
2.  <https://youtube.com/playlist?list=PLgUwDviBIf0qYbL4TBaEWgb-ljVdhkM7R> [Striver , Language- English]
3.  Live Classes of striver :-

-   <https://www.youtube.com/watch?v=SpS9dMj0B_Y>
-   <https://www.youtube.com/watch?v=B4t3NB0478k>
-   <https://www.youtube.com/watch?v=Kb3KOTQfjew>

Happy Coding, Happy Learning.\
PS - If You want more topics like that and also find this helpful then please comment down. And tell which topic you want next!

Master Binary Search | Full Guide | Placement Preparation | devdad

TOPICS WHICH YOU CAN'T SKIP | INTERVIEW PREPARATION | STUDY PLAN USING LEETCODE

### What is OBJECT-ORIENTED PROGRAMMING?

![](https://media.geeksforgeeks.org/wp-content/cdn-uploads/20190717114649/Object-Oriented-Programming-Concepts.jpg)

Object-oriented programming is a programming paradigm built on the concept of objects.\
In Other Words, it is an approach to problem-solving where all computations are carried out using objects.

1.  Program is divided into small parts called objects.
2.  Object-oriented programming follows a bottom-up approach.
3.  Have access specifiers like private, public, protected, etc.
4.  Adding new data and functions is easy.
5.  Provides data hiding so it is more secure than procedural programming.
6.  Overloading is possible in object-oriented programming.
7.  Data is more important than function.
8.  Provides the ability to simulate real-world
9.  Examples: C++, Java, Python, C#, JavaScript, Ruby, PHP, [VB.NET](http://vb.net/)

### TERMINOLOGIES

-   Class - A class is a group of objects that share common properties and behavior. It is a blueprint or template from which objects are created.

-   Object- Object is any real-world entity that can have some characteristics or which can perform some tasks. It is also called the instance of a class

For example, we can consider a car as a class that has characteristics like steering wheels, seats, brakes, etc.\
Class - color\
Red - an object of color

-   Constructor - Constructors are special methods whose name is the same as the class name. The constructors serve the special purpose of initializing the objects.

-   Interface - Like a class, an interface can have methods and variables, but the methods declared in an interface are by default abstract.

-   Default constructor - The default constructor is the constructor which doesn't take any argument. It has no parameters.

-   Parameterized constructor - The constructors that take some arguments are known as parameterized constructors.

-   Copy constructor - A copy constructor is a member function that initializes an object using another object of the same class.

-   Friend Function - It is basically a function that is used to access all private and protected members of classes.

-   Member Function - It is basically a function that can be declared as members of a class. It is usually declared inside the class definition and works on data members of the same class.

-   Destructor - It frees up the resources and memory occupied by an object. Destructors are automatically called when an object is being destroyed.

-   Subclass - The subclass is a part of Inheritance. The subclass is an entity, which inherits from another class. It is also known as the child class.

-   Superclass - Superclass is also a part of Inheritance. The superclass is an entity, which allows subclasses or child classes to inherit from itself.

-   Abstract Class - An abstract class is a special class containing abstract methods. The significance of abstract class is that the abstract methods inside it are not implemented and only declared. So as a result, when a subclass inherits the abstract class and needs to use its abstract methods, they need to define and implement them.

-   Abstract Method - An abstract method is a method that doesn't have anybody.

-   Methods - A method is a procedure or function in OOPs Concepts. It is a set of instructions that are associated with an object.

-   Static Method - A static method is a method that belongs to a class, but it does not belong to an instance of that class and this method can be called without the instance or object of that class. Non-static methods can access any static method and static variable, without creating an instance of the object.

-   Overloading - Overloading is a compile-time polymorphism feature in which an entity has multiple implementations with the same name.

-   Overriding - Whereas Overriding is a runtime polymorphism feature in which an entity has the same name, but its implementation changes during execution.

-   Exception - An exception can be considered as a special event, which is raised during the execution of a program at runtime, that brings the execution to a halt.

-   Exception handling - It is the mechanism for identifying the undesirable states that the program can reach and specifying the desirable outcomes of such states.\
    Try-catch is the most common method used for handling exceptions in the program.

-   Garbage Collection - It refers to the mechanism of handling the memory in the program. Through garbage collection, the unwanted memory is freed up by removing the objects that are no longer needed.

-   Interface v/s Abstract class difference - Interface and abstract classes both are special types of classes that contain only the method declaration and not their implementation. But the interface is entirely different from an abstract class. The main difference between the two is that, when an interface is implemented, the subclass must define all its methods and provide its implementation. Whereas when an abstract class is inherited, the subclass does not need to provide the definition of its abstract method, until and unless the subclass is using it.\
    Also, an abstract class can contain abstract methods as well as non-abstract methods

-   Private - The access level of a private modifier is only within the class. It cannot be accessed from outside the class.

-   Default - The access level of a default modifier is only within the package. It cannot be accessed from outside the package. If you do not specify any access level, it will be the default.

-   Protected - The access level of a protected modifier is within the package and outside the package through child class. If you do not make the child class, it cannot be accessed from outside the package.

-   Public - The access level of a public modifier is everywhere. It can be accessed from within the class, outside the class, within the package and outside the package.

### Why we use object-oriented programming?

Object-oriented programming is the programming paradigm that is defined using objects. Objects can be considered as real-world instances of entities like class, that have some characteristics and behaviors.

-   OOPs helps users to understand the software easily, although they don't know the actual implementation.
-   With OOPs, the readability, understandability, and maintainability of the code increases multifold.
-   Even very big software can be easily written and managed easily using OOPs.

### What are the main features of OOPs?

### Data Abstraction

1.  Data abstraction refers to providing only essential information about the data to the outside world, hiding the background details or implementation.
2.  Hiding the implementation and displaying only the functionality to the users.

#### Advantages

1.  It reduces the complexity of viewing things.
2.  Reduces the duplication of the code

#### Real Life Example

Consider a real-life example of a man driving a car. The man only knows that pressing the accelerators will increase the speed of the car or applying brakes will stop the car but he does not know about how on pressing the accelerator the speed is actually increasing, he does not know about the inner mechanism of the car or the implementation of the accelerator, brakes, etc in the car.

### Encapsulation

It describes the idea of bundling data and methods that work on that data within one unit.

#### Advantages

1.  Encapsulation protects an object from unwanted access by clients.
2.  Simplifies the maintenance of the application

#### Real Life Example

A Real-Life Example of Encapsulation is a School Bag.

### Polymorphism

The word polymorphism means having many forms. It describes the concept that different classes can be used with the same interface.\
Polymorphism is the ability of any data to be processed in more than one form.

Polymorphism is divided into two types:

-   Compile Time Polymorphism - Compile time polymorphism, also known as Static Polymorphism, refers to the type of Polymorphism that happens at compile time. What it means is that the compiler decides what shape or value has to be taken by the entity in the picture.

-   Runtime Polymorphism - Runtime polymorphism, also known as Dynamic Polymorphism, refers to the type of Polymorphism that happens at the run time. What it means is it can't be decided by the compiler. Therefore what shape or value has to be taken depends upon the execution. Hence the name Runtime Polymorphism.

#### Advantages

1.  It helps the programmer to reuse the codes, i.e. classes once written, tested and implemented can be reused as required. Saves a lot of time.
2.  A single variable can be used to store multiple data types.

#### Real Life Example

Like a man at the same time is a father, a husband, an employee. So the same person possesses different behavior in different situations. This is called polymorphism.

### Inheritance

Inheritance is a feature of OOPs which allows subclasses classes to inherit properties from the parent class.

Types of Inheritance

-   Single inheritance - When a class inherits from a single class, it is known as a single inheritance

-   Multiple inheritances - Multiple inheritances come into the picture when a class inherits from more than one base class.

    Parent 1 && Parent2 → child

-   Multilevel inheritance - When there is a chain of inheritance, it is known as multilevel inheritance.

    Example: Animal → Dog → Puppy\
    Puppy Inherits from the Dog Class, Dog class inherits from the Class Animal.

-   Hierarchical inheritance - When two or more classes inherit a single class, it is known as hierarchical inheritance.

    Example: Animal → Dog = Cats

-   Hybrid inheritance - Hybrid inheritance is a combination of multiple and multi-level inheritances.

#### Advantages

The main advantages of inheritance are code reusability and readability. When a child class inherits the properties and functionality of the parent class, we need not to write the same code again in the child class. This makes it easier to reuse the code, makes us write less code and the code becomes much more readable.

#### Real Life Example

If there is a class such as 'vehicle', other classes like 'car', 'bike', etc can inherit common properties from the vehicle class.

### What is Overloading and Overriding?

When two or more methods in the same class have the same name but different parameters, it's called Overloading.

When the method name and parameters are the same in the superclass and the child class, it's called Overriding.


### Code Examples

### Data Abstraction

JavaScript is a weakly typed language and does not have the classical built-in support for abstraction like OOP languages. Instead, JavaScript has the capability to support OOP, and thus can achieve OOP functionalities, which is known as Object Oriented JavaScript (OOJS). Data abstraction can be achieved by inheritance and composition.

In JavaScript, prototypes and closures can help us accomplish data abstraction.

```

function Employee(name, age, baseSalary) {
    this.name = name;
    this.age = age;
    this.baseSalary = baseSalary

    let monthlyBonus = 1000;

    // This is not exposed to the user
    let calculateMonthlyBonus = function () {
        let finalSalary = baseSalary + monthlyBonus
        console.log("Final Salary is : ", finalSalary)
    }

    this.getEmpDetails = function () {
        console.log("Name: " + this.name,
            "Age: " + this.age,
            "baseSalary: " + this.baseSalary)
    }
    calculateMonthlyBonus()
}

let emp1 = new Employee("John", 30, 2000);
emp1.getEmpDetails()

OUTPUT : Final Salary is :  3000
Name: John Age: 30 baseSalary: 2000

```

### Encapsulation

It describes the idea of bundling data and methods that work on that data within one unit.

```

class Employee {
    setEmpDetails(name, id, phone) {
        this.name = name;
        this.id = id;
        this.phone = phone;
    }

    getEmpName() {
        console.log(this.name);
    }
    getEmpId() {
        console.log(this.id);
    }
    getEmpPhoneNo() {
        console.log(this.phone);
    }
}

let emp1 = new Employee()
emp1.setEmpDetails("John", 319, 9788786086)
emp1.getEmpName();

OUTPUT : John

```

### Polymerphism

It is the ability to create a variable , a function or an object that has more than one form.

```

class Animal{

    constructor(name){
        this.name = name;
    }

    eats(){
        console.log(this.name, "eat food")
    }
}

class Alligator extends Animal{

    eats(){
        console.log(this.name, "eat fishes")
    }
}

let murphy = new Alligator("Murphy");
murphy.eats()

OUTPUT : Murphy eats fishes

```

### Inheritance

```

class Car {
    setName(name) {
        this.name = name;
    }

    startEngine() {
        console.log("Engine started For " + this.name);
    }
    stopEngine() {
        console.log("Engine stopped For " + this.name);
    }
}

class Toyota extends Car {

    topSpeed(speed) {
        console.log("Top Speed For " + this.name + " is " + speed);
    }
}

let myCar = new Toyota();
myCar.setName("Camry");
myCar.startEngine()
myCar.stopEngine()
myCar.topSpeed(200)

OUTPUT :
Engine started For Camry
Engine stopped For Camry
Top Speed For Camry is 200
```

Complete OOPS Guide | Interview Prepration | Freshers

I extensively researched about companies hiring internationally which support visa & relocation for SDE1/2 and above. So sharing list of companies with all of you:

**London**

- Google
- Amazon
- Apple
- Meta
- Bloomberg
- Spotify
- SnapChat
- Bytedance
- Yelp
- Vercel
- Bulb
- Mobiquity
- Expensify
- Free Now
- EF Education First
- Canva
- Intercom
- Curve
- The Lego group
- Plaid
- Transferwise
- Palantir Technologies
- Algolia
- Revolut
- PayFit
- SumUp
- Trainline
- Deliveroo
- Collibra
- Hashicorp

**Berlin, Germany**

- Amazon
- Zalando
- Ubisoft
- Klarna
- Delivery Hero
- Adnymics
- Hive.app
- N26
- Signavio
- Wayfair
- Free Now
- Trivago
- Babbel
- Personio
- RapidAPI
- HelloFresh
- PayFit
- SumUp
- Taxfix
- Blinkist
- SoundCloud
- Pitch
- Qonto
- Gorillas
- Hashicorp
- Project44
- TradeRepublic
- Immobilienscout24
- Clark
- Forto
- Raisin
- InVision
- Tipico
- Container xChange
- Sunday
- Celus
- Navvis
- e-Bot7
- Bigpoint

**Amsterdam, Netherlands**

- Databricks
- Uber
- Optiver
- Vercel
- Booking.com
- Mobiquity
- Miro
- Plaid
- SumUp
- Gorillas
- Hashicorp

**Dublin**

- Microsoft
- Amazon
- Vercel
- Verizon Connect
- Free Now
- Intercom
- Meta
- SquareSpace
- DataDog
- Luxembourg

FAQs❓

Q: Do we require to do masters/MS to work there?
A: No, most of these companies will provide visa & relocation.

Q: Does getting international job makes me more financially stable?
A: No, there are tons of better opportunities in India as well which pay huge these days. So decide accordingly.

Q: From where did you collected the above information?
A: LinkedIn posts of people joining XYZ company, companies mentioning in their job descriptions explicitly that they sponsor visa, India to EU Discord server, Shubheksha GitHub's repo.

Q: Can interns apply to international internships as well?
A: Most companies do not sponsor visa for interns, but some companies like Meta does for intern postions as well.

Q: Is interview process similar as compared to India?
A: Yes, the process is exactly similar.

Q. Do I need to upvote this post?
A: Ye bhi koi puchne ke baat hai :)

Feel free to comment down other companies with whom you interviewed!

International Hiring for SDEs in India | International Offer Companies | VISA included | SDE-1,2,3 | by devdad

I continue to see posts here complaining about finding good women. I’ll explain to you what they key is in sausage fest tech metros.

![](https://i.scdn.co/image/ab67616d0000b2734e6ab1cb432cc722b0ec91e8)

I will assume you are the stereotype Sigma Male SWE that works all day, hits the gym (if you don’t, that’s a minimum requirement), then does some sort of “studying” or whatever after.

Dating in tech Metros is hard. You might think that most women are extremely leftist / child free / abolitionist colored hair people. The truth is, these people are the most desperate and most available because they are the least desirable. There are normal women to choose from, many great female friends in SF tell me they can’t find anyone good to date.

Generally, the normal ones are taken, don’t want to date software engineers due to bad experiences in the past, or can be found only via friend groups because they were burned 1 too many times on dating apps. I’m grateful I’m engaged to a great person. My fiancé has repeatedly said that if she hadn’t dating me she’d be filtering out SWEs on dating apps too.

I think part of the reason you might find dating hard is because of the “bro-y” lifestyle SWE dudes live. Hustle culture, move here for a job and make no community connections, no hobbies / SWE stereotype hobbies like Rock Climbing, profile pic is the guy in sunglasses, slim profile with a little bit of muscle, etc. The biggest one though is SWEs can’t talk about anything but tech, politics, and money, and the best women do not care about that. They care about people, family, and hobbies.

So here are a few tips:

- Make friends with the kind of people you’d be compatible with. The friend group can’t be a sausage fest. Women will come.

- Become a part of your community. Volunteer for example, you’ll get to know many great people. The women will be normal.
 
- Get a hobby that isn’t some boring stereotype. “Oh you do rock climbing and gym?? Wow I’ve heard that from every other tech guy this week.” Hobby = interesting, interesting = relationship. Try archery, shooting, woodworking, etc. It’s something to talk about that isn’t tech, and you can meet good women via many hobbies.

- Don’t talk about finance or politics around women. Touch on tech briefly to explain your job / passion and that’s it. The best women I’ve met care much more about relationships, friends, family, and hobbies. They will be interested in you if you can hold an hour long conversation and focus on people.
 
- Your looks honestly don’t matter that much. Just be healthy, don’t be too overweight, shave or groom your facial hair well, and be clean / smell good. Don’t have greasy hair. The bar for men is very low, all of the above are dirt easy to do.

- Your race does matter, in spite of what people tell you. White women prefer white men, for example.

- Oh, and don’t wear those cringy tech shirts. Get some brand-less clothes and some nice well-fitting clothes for dates. Ask a female, gay, or well-dressed friend if you really need help here.
 
- for the love of god, don’t blab about your startup / startups for the entire date. Women DO NOT care that much. Passion is very attractive, but only to a point.
 
- Be ready to settle down, and prioritize your relationship over work. Great women will be able to feel out whether or not you’re going to prioritize them—“founder” is a big 🚩🚩
 
- Don’t flash your money unless you want to attract people who just date you for the money.
 
- If you must do dating apps, don’t put SWE in your profile, add pictures of you with friends (preferably mixed gender), avoid sunglasses pics, and be well groomed / dress well. Hobby pics are ok too.
 
- The women that want to fuck on the first few dates are often the worst ones to date. Don’t go into a date looking for sex, look for a relationship. The sex will come.
 
- De-techify your apartment / room. One person I know has pictures of inspiring people on the wall, including Bezos & Musk. Women will see that & run. Move your office out of your bedroom if you have the space.

Thank you for coming to my Ted talk!

Dating in Software Engineering World by devdad | Blogs and Jobs

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Tech.

How Internet Works Explained in Easy Steps | by devdad

Himanshu Ranjan

Master Binary Search | Full Guide | Placement Preparation | devdad

Himanshu Ranjan

Why We need Binary Search:-

Topic wise learning of Binary Search:

TOPICS WHICH YOU CAN'T SKIP | INTERVIEW PREPARATION | STUDY PLAN USING LEETCODE

Himanshu Ranjan

Complete OOPS Guide | Interview Prepration | Freshers

Himanshu Ranjan

What is OBJECT-ORIENTED PROGRAMMING?

International Hiring for SDEs in India | International Offer Companies | VISA included | SDE-1,2,3 | by devdad

Himanshu Ranjan