Programming & AI Tips 💡

Reference Types in the Real World 🌍

Compare that with the situation where you’re reading a web page. 🌐

This time, all you have to give your friend is the URL of the web page. ↗️

This is reference type behavior, with the URL taking the place of the reference. ↔️

In order to read the document, you have to navigate the reference by putting the URL in your browser and asking it to load the page. ☝🏻

If the web page changes for some reason, both you and your friend will see that change the next time each of you loads the page. 🙇🏻

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#Types #ReferenceTypes
@ProgrammingTip

Value Types in the Real World 🌍

Suppose you’re reading something fantastic, and you want a friend to read it too. 📜

What do you need to give your friend so that he can read it too❓

To give your friend a copy, you’d need to photocopy all the pages and then give it to him, At that point, he has his own complete copy of the document. 📃

In this situation, you’re dealing with value type behavior❗️

All the information is directly in your hands, you don’t need to go anywhere else to get it.

Your copy of the information is also independent of your friend’s after you’ve made the copy. 👥

You could add some notes to your pages, and his pages wouldn’t be changed at all.🙅🏻‍♂️

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#Types #ValueTypes
@ProgrammingTip

#Fun Is That integer or... !! 🤔
@ProgrammingTip

JavaScript Clean Code 🛠

Use getters and setters 💡

Bad :

function makeBankAccount() {

  return {
    balance: 0,
    // ...
  };
}

const account = makeBankAccount();
account.balance = 100;

Good :

function makeBankAccount() {
  let balance = 0;

  function getBalance() {
    return balance;
  }

  function setBalance(amount) {
    balance = amount;
  }

  return {
    getBalance,
    setBalance,
  };
}

const account = makeBankAccount();
account.setBalance(100);

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#JSTips #CleanCode
@ProgrammingTip

Use String.valueOf() instead of toString() 💎

If obj needs to be converted to string then the result of obj.toString() and String.valueOf(obj) will be same.

But String.valueOf() is Null Safe, means it will never throw NullPointerException. 🎯

Test test = null;

// Below statement will not throw NPE
System.out.println(String.valueOf(test));

// Next statement will throw NPE
System.out.println(test.toString())

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#java #string
@ProgrammingTip

📦 Grab The Stack Trace Of An Exception 📦

Checking your code for errors is one of the most Painstaking – and frustrating – parts of the development process. 🙆🏻‍♂️

It’s also horrendously Time-Consuming, particularly if you’ve a pesky error whose source isn’t immediately clear. 💡

Using this code, you can more easily track down where an Exception is occurring – and bring yourself that much closer to being rid of it. ✅

Code

Exception e = …;
java.io.StringWriter sw = new java.io.StringWriter();
e.printStackTrace(new java.io.PrintWriter(sw));
String trace = sw.getBuffer().toString();

#java #exception #error #trick
@ProgrammingTip

Announcing .NET Core 2.0 🔥

.NET Core 2.0 is available today as a final release. 📦

You can start developing with it at the command line, in your favorite text editor, in Visual Studio 2017 15.3, Visual Studio Code or Visual Studio for Mac.

It is ready for production workloads, on your own hardware or your favorite cloud, like Microsoft Azure.

Microsoft also released ASP.NET Core 2.0 and Entity Framework Core 2.0 💎

https://blogs.msdn.microsoft.com/dotnet/2017/08/14/announcing-net-core-2-0/

Download SDK :
https://www.microsoft.com/net/download/core

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#DotNet #ASPNET #Core
@ProgrammingTip

Async & Await in JavaScript 🔥

Async/Await will make your code simpler even more than you think. ✅

Stop writing callback functions and love JavaScript ES7. 💎

https://blog.patricktriest.com/what-is-async-await-why-should-you-care/

#JavaScript #CleanCode
@ProgrammingTip

Google Material GuideLines for Implementation UI 📖

The Material Design guidelines are a living document of visual, interactive, and motion guidance. 💎

https://material.io/guidelines/

#Android #Material
@ProgrammingTip‌

JavaScript Clean Code 🛠

Avoid negative conditionals 💡

Bad :

function isDOMNodeNotPresent(node) {
  // ...
}

if (!isDOMNodeNotPresent(node)) {
  // ...
}

Good :

function isDOMNodePresent(node) {
  // ...
}

if (isDOMNodePresent(node)) {
  // ...
}

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#JSTips #CleanCode
@ProgrammingTip

Apress Pro ASP.NET SignalR 📘
Author : Keyvan Nayyeri 🖊

#Book #aspnet #Signalr
@ProgrammingTip

Online VS Code IDE for Angular & React & Ionic 💎

Features :
🔸Intellisense, Project Search, Go to Definitions.
🔹Hot reloading as you type.
🔸Import NPM packages into your project.
🔹Keep editing while offline
🔸Hosted app URL where you can see (or share) your live application at any time.

https://stackblitz.com/

Try it, it's awesome 😍

#Angular #React #Ionic
@ProgrammingTip

#Fun He'll Punish Them!
@ProgrammingTip

Axios 👾

Promise based HTTP client for the browser and node.js .

Features :
🔸Make XMLHttpRequests from the browser
🔹Make http requests from node.js
🔸Supports the Promise API
🔹Intercept request and response
🔸Transform request and response data
🔹Cancel requests
🔸Automatic transforms for JSON data
🔹Client side support for protecting against XSRF

https://github.com/mzabriskie/axios

Use it instead of old AJAX, it's very simple & handy 🔥

#JavaScript #Ajax
@ProgrammingTip

JavaScript Clean Code 🛠

Don't use flags as function parameters 💡

Bad :

function createFile(name, temp) {
  if (temp) {
    fs.create(`./temp/${name}`);
  } else {
    fs.create(name);
  }
}

Good :

function createFile(name) {
  fs.create(name);
}

function createTempFile(name) {
  createFile(`./temp/${name}`);
}

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#JSTips #CleanCode
@ProgrammingTip

📦 Macro To Get Array Size Of Any Data Type In C 📦

The following macro will help you in getting the size of an array of any data type. It works by dividing the length of the array to the size of its field. 💡

Code:

#define num(x) (sizeof (x) / sizeof (*x)) 

int  _tmain() {
   int numbers[10] = 
       {1,1,1,1,1,1};

   char *chars[20] =
       {"","","","","","","","",""};

   printf("Size of numbers[10] is %d\n", 
       num(numbers));

   printf("Size of chars[20] is %d\n",
       num(chars));
}

Output:

  Size of numbers[10] is 10 

  Size of chars[20] is 20  

  Press any key to continue . . .

#c #cpp #array
@ProgrammingTip

C# Events & Delegates ⚜️

Instructor : Mosh Hamedani 🎥

#CSharp #Events #Delegates
@ProgrammingTip

JavaScript Clean Code 🛠

Functions should do one thing 💡

Bad :

function emailClients(clients) {
  clients.forEach((client) => {
    const clientRecord = database.lookup(client);
    if (clientRecord.isActive()) {
      email(client);
    }
  });
}

Good :

function emailActiveClients(clients) {
  clients
    .filter(isActiveClient)
    .forEach(email);
}

function isActiveClient(client) {
  const clientRecord = database.lookup(client);
  return clientRecord.isActive();
}

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#JSTips #CleanCode
@ProgrammingTip

🖼 Rescale Image In Java 🖼

An image can rescaled using AffineTransform. First of all, Image Buffer of input image is created and then scaled image is rendered. ✔️

BufferedImage imgSource = 
   ImageIO.read(new File("myImage.jpg"));

BufferedImage imgDest = 
   new BufferedImage(100, 100,
   BufferedImage.TYPE_INT_RGB);

Graphics2D g2d = imgDest.createGraphics();

AffineTransform affinetransformation =
   AffineTransform.getScaleInstance(2, 2);

g2d.drawRenderedImage(imgSource,
    affinetransformation);

ImageIO.write(imgDest, "JPG", 
   new File("outImage.jpg"));

#java #image
@ProgrammingTip

E = MC2 🤣

#Fun
@ProgrammingTip