Programming & AI Tips 💡

Understanding Callbacks, Promises, Observables and async/await 🤷🏻‍♂️ Whilst we only had callbacks for quite some time, in recent years promises, observables and lately async/await enriched the JavaScript world. Let's take a closer look at these features and how they differ in this article❗️ https://academind.com/articles/javascript/callbacks-promises-observables-async-await #JavaScript #Observables #Async #Promise @ProgrammingTip

Road Map 👣 Back-End Web Developers 🛠 #RoadMap #BackEnd @ProgrammingTip

Road Map 👣 Front-End Web Developers 💎 #RoadMap #FrontEnd @ProgrammingTip

JavaScript Clean Code 🛠 Only comment things that have business logic complexity. 💡 Comments are an apology, not a requirement. Good code mostly documents itself. Bad :

function hashIt(data) {
  // The hash
  let hash = 0;

  // Length of string
  const length = data.length;

  // Loop through every character in data
  for (let i = 0; i < length; i++) {
    // Get character code.
    const char = data.charCodeAt(i);
    // Make the hash
    hash = ((hash << 5) - hash) + char;
    // Convert to 32-bit integer
    hash &= hash;
  }
}

Good :

function hashIt(data) {
  let hash = 0;
  const length = data.length;

  for (let i = 0; i < length; i++) {
    const char = data.charCodeAt(i);
    hash = ((hash << 5) - hash) + char;

    // Convert to 32-bit integer
    hash &= hash;
  }
}

➖➖➖➖➖➖ #JSTips #CleanCode @ProgrammingTip

Code School Courses for Free 💎 Just 1 day & 15 hours left. 🔸 https://www.codeschool.com/free-weekend #Tutorial #Course @ProgrammingTip

THX 💎 This WebGL banner is so captivating ❗️ I can't stop playing with it, it's incredible. 😍 http://www.thx.com/ #WebGL #FreeTime @ProgrammingTip

Do casts if it's necessary ❗️ When you're casting an object, you are choosing to ask the compiler to trust you at compile time and to generate a check that will run at execution time to keep you honest. 🙋🏻‍♂️ #Casting @ProgrammingTip

➕ Add Any Numbers Without “+” Operator In C ➕ Bitwise operators can be used to perform the addition (+) operation as mentioned in below example 🔆

int Add(int x, int y)
{
   if (y == 0)
     return x;
   else
     return Add( x ^ y, (x & y) << 1);
}

〰〰〰〰〰〰〰〰〰〰〰〰〰〰〰〰 #c #cpp #operator @ProgrammingTip

What happens when you enter "google.com" into a browser❓ This text attempts to answer this question with as much extreme detail as possible. 🤷🏿‍♂️ https://github.com/alex/what-happens-when/blob/master/README.rst 〰〰〰〰〰〰 #Fun #FreeTime @ProgrammingTip

JavaScript Clean Code 🛠 Async/Await are even cleaner than Promises 💡 Bad :

get('https://en.wikipedia.org/wiki/Robert_Cecil_Martin')
  .then((response) => {
    return writeFile('article.html', response);
  })
  .then(() => {
    console.log('File written');
  })
  .catch((err) => {
    console.error(err);
  });

Good :

async function getCleanCodeArticle() {
  try {
    const response = await get('https://en.wikipedia.org/wiki/Robert_Cecil_Martin');

    await writeFile('article.html', response);

    console.log('File written');
  } catch(err) {
    console.error(err);
  }
}

➖➖➖➖➖➖ #JSTips #CleanCode @ProgrammingTip

GraphQL 🔥 A query language for your API 💎 GraphQL is a query language for APIs and a runtime for fulfilling those queries with your existing data. GraphQL provides a complete and understandable description of the data in your API, gives clients the power to ask for exactly what they need and nothing more, makes it easier to evolve APIs over time, and enables powerful developer tools. http://graphql.org/ https://scaphold.io/ 〰〰〰〰〰〰 #GraphQL #API @ProgrammingTip

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. 🙇🏻 〰〰〰〰〰〰 #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.🙅🏻‍♂️ 〰〰〰〰〰〰 #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);

➖➖➖➖➖➖ #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())

〰〰〰〰〰〰 #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 〰〰〰〰〰〰 #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