DEV Community: Nahid Hasan

Extra facebook bloatware that stays even after uninstall.

Nahid Hasan — Thu, 01 Sep 2022 08:51:42 +0000

I installed facebook to watch some live event. after that, i uninstalled the app.few days after i was watching youtube ads related the that event.

after little searching i found there are hidden java packages still install in my phone.

There extra bloatware exits even after uninstall

package:com.facebook.system package:com.facebook.services package:com.facebook.appmanager

you can uninstall them by these commands

adb shell pm list packages adb uninstall --user 0 <pkg_name>

Real Story : Developers are blaming each other for a fault .

Nahid Hasan — Tue, 16 Mar 2021 09:52:07 +0000

Recently I experienced such incident , in my work place , one Android app developer is being blamed for app crush by backend developer to the HR/Managers .

The Real real reason was like this from neutral point , the app developer handled the api like the doc given to him earlier. in the mean time , the backend changed. but app developer didn't know any of that changes. he did not handle every thing properly.
Backend developer didn't keep track with the app dev.

When the judgement app was tested , it crushed in front of managers and suddenly everyone was angry.

Backend developer started to blame the app developer , so does the app developer. Many things happened afterwards. Manager joined other ventures. The two dev can't see each other , but working in same company because of partially covid reasons.

The Project eventually failed after working for about 1 year.

JS : Do we need Library for simple date formatting? What can you Do ...

Nahid Hasan — Tue, 16 Mar 2021 03:20:59 +0000

We regularly use a date formatting library like moment.js date-fns in our project. I often i see that , i
use it for simple date formatting.

But there is no need to use any library to format date in JavaScript.

Like , for this, 15 - 2 - 2021 you can use

{ new Date(time).getDate() + ' / ' + parseInt(new Date(time).getMonth() + 1) + ' / ' + new Date(time).getFullYear() }

For Am, Pm , like 9 am, You can use this ,

{ new Date().toLocaleString('en-US', { hour: 'numeric', hour12: true }) }

Also what more you can do is, you can make a tiny npm package and share it in your team.

Thank for reading, have a nice day.

ডকার বিগেইনার্স গাইড। Docker Beginners Guide In Bengla. Run an API Service with Database and Redis. Youtube series -

Nahid Hasan — Wed, 27 Jan 2021 07:21:43 +0000

https://www.youtube.com/watch?v=P-BwzLXUIVA
https://www.youtube.com/watch?v=k3p4dDeAEks&ab_channel=NahidHasan

Linux Command line utilities i use almost everyday, why they are useful

Nahid Hasan — Sun, 18 Oct 2020 16:01:20 +0000

pwd – current working directory .

ls – list all the folders in current working directory .

cd /dir_path – Go to certain directory .

cp rm mv – copy , remove and move files

mkdir dir_name – make a folder in current working directory .

chmod -options read_write_execute dir_path – set the mode (permissions) for current directory.

sudo username – select certain user configuration.

df – disk uses .

top – CPU and memory uses .

curl or wget url – http request in terminal

nano – terminal code editor

tar or unzip – unzip compressed file

ssh – remote login to computer

export – set up environment variables .

ufw – firewall for server

kill – kill a running process.

ifconfig – network utility .

So far that’s it , i will try to add more .

Five Cool Ways to Iterate over JavaScript String

Nahid Hasan — Wed, 23 Sep 2020 11:18:31 +0000

First

Using Array.from() method

let hello =  "World"

// first

Array.from(hello).map(i => console.log(i))

second

using for ...of loop

// second

for (let char of hello){
  console.log(char)
}

third

using built in split() method in String()

// third

hello.split("").forEach(i => console.log(i))

fourth

ancient for loop

// fourth

for (let i = 0; i < hello.length ; i++) {
  console.log(hello[i])
}

// five

using fancy generator function and for ... loop

//  five advance 

function* iter(str) {
    let i = 0
    while(i < str.length) {
       yield str[i];
       i++
    }
}

for (let char of iter(hello)){
  console.log(char)
}

Let Me Know Others . Thanks

How do you keep up With fellow developers who are always bragging about themselves ?

Nahid Hasan — Sun, 01 Mar 2020 07:33:53 +0000

There are people who are always bragging about they know everything in software development in workplace. they try to picture themselves as perfect in front of everyone.

Practical example of JavaScript class and Object By making a todo list app

Nahid Hasan — Tue, 25 Feb 2020 08:31:20 +0000

First we need to know the basics of class in Javascript

From MDN ,

Javascript class are primarily syntactical sugar over JavaScript's existing prototype-based inheritance.

Class declarations

To declare a class, you use the class keyword with the name of the class.

class Rectangle {
  constructor(height, width) {
    this.height = height;
    this.width = width;
  }
}

Class Expression is another way

let Rectangle = class {
  constructor(height, width) {
    this.height = height;
    this.width = width;
  }
};

important thing to remember

The body of a class is executed in strict mode.

two types of methods

1 . Prototype methods

class methods

2 . Static methods

static method has no this . this used for creating utility functions

Private field declarations

class Rectangle {
  #height = 0;
  #width;
  constructor(height, width) {
    this.#height = height;
    this.#width = width;
  }
}

The extends keyword

The extends keyword is used in class declarations or class expressions to create a class as a child of another class.

The super Keyword is used to access parents properties

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

  speak() {
    console.log(`${this.name} makes a noise.`);
  }
}

class Dog extends Animal {
  constructor(name) {
    super(name); // call the super class constructor and pass in the name parameter
  }

  speak() {
    console.log(`${this.name} barks.`);
  }
}

let d = new Dog('Mitzie');
d.speak(); // Mitzie barks.

Setter and Getter Methods

get and set keywords before function actually binds an object property to a function that will be called when that property is looked up.

class Rectangle {
  constructor(height, width) {
    this.height = height;
    this.width = width;
  }

  get Area() {
      return  this.height * this.width
  }
}

Now the Practical example . We create a MakeTodoList Class

class MakeTodoList {
  constructor(list) {
    this.todoList = list;
    this.todos = [];
  }
}

we also add some utility fuction as static method.

  static addtoList(text) {
    let list = document.getElementById("todo-list");
    var li = document.createElement("li");
    li.textContent = text;
    list.appendChild(li);
    return li;
  }

  static removeFromList(text) {
    let list = document.getElementById("todo-list");
    let childs = Array.from(list.childNodes);
    let item = childs.find(i => i.innerText === text);
    return item;
  }

we add two property methods to add and delete todo

  addTodo(text) {
    this.todos.push(text);
    this.todoList.appendChild(MakeTodoList.addtoList(text));
  }

  removeTodo(text) {
    let filter = this.todos.filter(i => i !== text);
    this.todoList.removeChild(MakeTodoList.removeFromList(text));
    this.todos = filter;
  }

we set some dummy data to list using the setter method

  set DummyData(value) {
    this.todos = value;
    this.todos.map(i => MakeTodoList.addtoList(i));
  }

we can observe the current items by getter method

  get getList() {
    return this.todos;
  }

we have created our class but how to use this class ? Ok . First we need a object of this class

    let listEle = new MakeTodoList(list);

we set the dummy data using setter method and set the data using getter method

    listEle.DummyData = ["Play FootBall", "Do Homework"]; // setter method for Dummy Data
    console.log("current  ...........", listEle.getList); //   getter method

now the main part

add todo

 listEle.addTodo(input); //  calling method from class

remove todo

 listEle.removeTodo(target.innerText);

You can find the full code in GitHub

full code