DEV Community: Reagan Scofield

OOPs Concepts in TypeScript. What is the 4, Basics of Object-Oriented Programming Fundamentals & their Examples

Reagan Scofield — Wed, 12 Jan 2022 19:20:48 +0000

1. Abstraction

Abstraction lets programmers create useful and reusable tools. For example, a programmer can create several different types of objects, which can be variables, functions or data structures. Programmers can also create different classes of objects as ways to define the objects. For instance, a class of variable might be an address. The class might specify that each address object shall have a name, street, city and zip code. The objects, in this case, might be employee addresses, customer addresses or supplier addresses.

Abstraction Example:

abstract class Address {
    private street: string;
    private city: string;
    private codePostal: number;

    constructor(street: string, city: string, codePostal: number){
        this.street = street;
        this.city = city;
        this.codePostal = codePostal;
    }

    public getFullAddress(): string {
        return `${this.street}, ${this.city}, ${this.codePostal}`;
    }
}

class FirstCustomer extends Address {
    constructor(street: string, city: string, codePostal: number){
        super(street, city, codePostal);
        console.log(city)
    }
}

class SecondCustomer extends Address {
    constructor(street: string, city: string, codePostal: number){
        super(street, city, codePostal);
        console.log(city)
    }
}

new FirstCustomer("234 Washigton Road", "Honolulu", 283930);
new SecondCustomer("456 Mandela Street", "New Jarsey", 58893);

2. Encapsulation

Encapsulation lets us reuse functionality without jeopardising security. It’s a powerful, time-saving OOP concept in TypeScript which related to Java. For example, we may create piece of code that calls specific data from a database. It may be useful to reuse that code with other databases or processes. Encapsulation lets us do that while keeping our original data private. It also lets us alter our original code without breaking it for others who have adopted it in the meantime.

Encapsulation Example:

class Customer {
    private name: string;
    private surname: string;

    public getFullName(): string {
      return `${this.name} - ${this.surname}`;
    }

    public setNames(name: string, surname: string): void {
      this.name = name;
      this.surname = surname;
    }
}

class SetGetCustomer {
    constructor(){
        const name: string = "Jon";
        const surname: string = "Snow";
        const customer: Customer = new Customer();
        customer.setNames(name, surname);
        const fullname: string = customer.getFullName();
    }
}

new SetGetCustomer();

3. Inheritance

Inheritance is another labor-saving OOP concept that works by letting a new class adopt the properties of another. We call the inheriting class a subclass or a child class. The original class is often called the parent. We use the keyword extends to define a new class that inherits properties from an old class.

Inheritance Example

class ParentCustomer {
    private surname: string = "Scofield";
    public familyName(): string {
        return this.surname;
    }
}

class ChildCustomer extends ParentCustomer {
    private name: string;
    constructor(name: string){
        super();
        this.name = name;
    }
    public childFullName(): string {
        const surname: string = this.familyName();
        return `${this.name} - ${surname}`;
    }
}

new ChildCustomer("Aleah");
new ChildCustomer("Reagan");

4. Polymorphism

Polymorphism in TypeScript works by using a reference to a parent class to affect an object in the child class. We might create a class called “horse” by extending the “animal” class. That class might also implement the “professional racing” class. The “horse” class is “polymorphic,” since it inherits attributes of both the “animal” and “professional racing” class. Two more examples of polymorphism in Java are method overriding and method overloading.

In method overriding, the child class can use the OOP polymorphism concept to override a method of its parent class. That allows a programmer to use one method in different ways depending on whether it’s invoked by an object of the parent class or an object of the child class.In method overloading, a single method may perform different functions depending on the context in which it’s called. This means a single method name might work in different ways depending on what arguments are passed to it

Polymorphism Example

class CustomerPolymorphism {
    canComplaining(): void {
        console.log("The Customer is wrong on this matter");
    }
}

class CustomerPolymorphismOverride extends CustomerPolymorphism {
    canComplaining(): void {
      console.log("Stop that, We y'all Customer is always right no matter what")
    }
    public main(): void {
      this.canComplaining();
    } 
}

const customerPolymorphismOverride: CustomerPolymorphismOverride = new CustomerPolymorphismOverride();
customerPolymorphismOverride.main();

Let's us connect on linkedIn. profile name is: Reagan Scofield Mukandila

Interesting Python Tools and Libraries

Reagan Scofield — Fri, 11 Jun 2021 04:53:28 +0000

ElectricEye
Continuously monitor your AWS services for configurations that can lead to degradation of confidentiality, integrity or availability.

Gramformer
A framework for detecting, highlighting and correcting grammatical errors on natural language text.

WholeFoodsFrugality
A Tool to Find Sales at Grocery Chains.

PyTCP
PyTCP is an attempt to create a fully functional TCP/IP stack in Python. It supports TCP stream based transport with reliable packet delivery based on sliding window mechanism and basic congestion control. It also supports IPv6/ICMPv6 protocols with SLAAC address configuration.

Graph4NLP
Graph4nlp is the library for the easy use of Graph Neural Networks for NLP.

Openspeech
Open-Source Toolkit for End-to-End Speech Recognition leveraging PyTorch-Lightning and Hydra.

HyperLib
Library that contains implementations of machine learning components in the hyperbolic space.

Converting DMS (Degrees, Minutes, Seconds) to Decimal & Decimal to DMS

Reagan Scofield — Sat, 22 May 2021 13:12:45 +0000

Everytime I am looking for npm package that will meet my requirements and end up by not finding any package on npm site I always try to write it myself and then publish it to npm so last week I was working on the features which need to receive a DMS (Degrees Minutes and Seconds) value and then convert it to Decimal and return the decimal so I wrote this package which does all the case the first function does convert DMS to Decimal and the second function does convert Decimal to DMS.

The Dms2Decimal function take 4 parameters degrees, minutes, second as an integer and direction as a string, it will return 0 if not found and return decimal numbers if found.

The Decimal2DMS does take 2 parameters decimal as a float and type as a string the type value need to be latitude or longitude and this will return null if not found or it will return a string in this format 23°34'5"N if found.

Implementation

    import { Decimal2DMS, DMS2Decimal } from 'dms-to-decimal';

    // Converting Degrees Minutes Seconds to Decimal 
    const degree = 46;
    const minutes = 59;
    const seconds = 5;
    const direction = 'N';

    const converDms2Decimal = DMS2Decimal(degree, minutes, seconds, direction);
    console.log(converDms2Decimal); // Output: 46.984722222222224

    // Converting Decimal to Degrees Minutes Sesonds
    const type = 'longitude';
    const decimal = -122.90222222222222;

    const converDecimal2DMS = Decimal2DMS(decimal, type);
    console.log(converDecimal2DMS) // Output: 122°54'7"W

here are the link to the npm package and I am busy with Python.

https://www.npmjs.com/package/dms-to-decimal