🚀 The Future of Frontend Engineering: Trends to Watch in 2025

As technology continues to evolve at an unprecedented pace, frontend engineering remains at the forefront of innovation. For leaders, staying ahead of trends is crucial to drive organizational success and ensure teams are equipped to deliver cutting-edge solutions. The year 2025 promises transformative trends that will redefine how developers build and users interact with web and mobile applications. Here are the top trends to watch in frontend engineering this year, with a focus on strategic insights for leadership

🧑‍🏫 Run DeepSeek-R1 Locally for Free in Just 3 Minutes!

DeepSeek-R1 has been creating quite a buzz in the AI community. Developed by a Chinese AI company DeepSeek, this model is being compared to OpenAI's top models. The excitement around DeepSeek-R1 is not just because of its capabilities but also because it is open-sourced, allowing anyone to download and run it locally. In this blog, I'll guide you through setting up DeepSeek-R1 on your machine using Ollama.

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🔐How to Set Up Two-Factor Authentication on WordPress Without Plugin

A step-by-step guide to add a 2-Factoe Authentication (2FA) system to your WordPress website.

🔬Micro Frontends

If you are a big history fan and love daydreaming about the most effective war strategies, chances are you’re also a big fan of the war of the third coalition.

Why am I starting a blog with this? Well, one thing we all picked up from that war is one of the things that made Napoleon Bonaparte the best general in history (In my opinion) — SPEED!

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🚸 Inline conditionals in CSS?

Last week, we had a CSS WG face-to-face meeting in A Coruña, Spain. There is one resolution from that meeting that I’m particularly excited about: the consensus to add an inline if() to CSS. While I was not the first to propose an inline conditional syntax, I did try and scope down the various nonterminating discussions into an MVP that can actually be implemented quickly, discussed ideas with implemenators, and eventually published a concrete proposal and pushed for group resolution. Quite poetically, the relevant discussion occurred on my birthday, so in a way, I got if() as the most unique birthday present ever. 😀

🚀 Kickstarting the "JavaScript from Zero to Junior" Course! 🚀

We’re launching our complete and in-depth JavaScript course! Today’s first topic: Variables and Data Types. You’ll learn:
✅ How to declare variables (var, let, const)
✅ All JavaScript data types
✅ Common pitfalls and tricky cases
✅ Interview questions you might encounter

📌 Read the first lesson and practice your skills!

Task 1: Correct the mistakes

The code below contains errors related to declaring and changing variables. Find and fix them.

var age = 25;
let age = 30; 

const pi;
pi = 3.14;

let name;
console.log(typeof name === "null");

✅ Write your version in the comments 📝

🔎 Look for a hint:

let age = 30; // Error: Re-advertisement
Use let instead of var. Now you can change the value without re-declaring the variable.
age = 30;

const pi; // Error
Сonst variable must be initialized. We need to declare and immediately initialize const:
const pi = 3.14;

console.log(typeof name === "null"); // Error
It is incorrect because typeof null returns "object" due to a bug in JS. You just need name === null.

#jsTasks

Task 2: Determine the data type

What will be logged to the console in each case? Explain why.

console.log(typeof "hello");  
console.log(typeof 42);  
console.log(typeof true);  
console.log(typeof null);  
console.log(typeof undefined);  
console.log(typeof {});  
console.log(typeof []);  
console.log(typeof function() {});  
console.log(typeof NaN);  
console.log(typeof 100n);  

✅ Write your version in the comments 📝

🔎 Look for a hint:

console.log(typeof "hello"); // "string"
console.log(typeof 42); // "number"
console.log(typeof true); // "boolean"
console.log(typeof null); // "object" (историческая ошибка в JS)
console.log(typeof undefined); // "undefined"
console.log(typeof {}); // "object"
console.log(typeof []); // "object" (массивы тоже объекты)
console.log(typeof function() {}); // "function" (фактически объект, но JS так определяет функции)
console.log(typeof NaN); // "number" (NaN – специальное значение типа number)
console.log(typeof 100n); // "bigint"

Explanation:
"typeof null" returns "object" due to a bug that has existed since early versions of JavaScript.
"typeof NaN" is "number" because NaN is an invalid numeric value.
"typeof []" is "object" because arrays in JavaScript are a type of object.
"typeof function() {}" is "function", but in reality, it is a subtype of an object.

Task 3: Type casting

What will be printed to the console? Explain why.

console.log("5" + 3);  
console.log("5" - 3);  
console.log(5 + true);  
console.log("10" * "2");  
console.log("10px" - 2);  
console.log(null + 5);  
console.log(undefined + 5);  
console.log(!!"false");  
console.log(!!0);  
console.log(Boolean([]));  

✅ Write your version in the comments 📝

🔎 Look for a hint:

1. "53" (concatenation, since "5" is a string)
2. "2" (the string "5" is converted to a number)
3. "6" (true is converted to 1)
4. "20" (both values ​​are converted to numbers)
5. "NaN" (you can't subtract a number from a string of letters)
6. "5" (null is converted to 0)
7. "NaN" (undefined can't be a number)
8. "true" (a non-empty string is truthy)
9. "false" (0 is falsy)
10. "true" (an array is a truthy value)

Explanation:
JS automatically converts strings and numbers in arithmetic operations.
null becomes 0, undefined becomes NaN.
!! is a double logical negation that turns a value into true or false.

Task 4: Using let, const, var

What will be the result of running the code? Why?

console.log(a);  
var a = 10;

console.log(b);  
let b = 20;

if (true) {
    var x = 50;
}
console.log(x);

if (true) {
    let y = 60;
}
console.log(y);

✅ Сhoose the correct option 📝

🔎 Look for a hint:

1. undefined (due to hoisting, variable is declared but not yet initialized)

2. Error! Variable is declared but is in the "dead zone" (TDZ)

3. 50 (var variable is accessible outside the block)

4. Error! y is only defined in the if block

Explanation:
var is hoisted but not initialized, so console.log(a); prints undefined.
let and const are not hoisted, so console.log(b); throws an error.
var is not block scoped, so x is accessible outside the block.
let is scoped to {} and y is not accessible outside the if block.

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Task 5: Determine the result of the code

What will be the result of executing the following code? Why?|

let foo = { n: 1 };
let bar = foo;
bar.n = 2;

console.log(foo.n);

let a = [1, 2, 3];
let b = a;
b.push(4);

console.log(a);

let x = "hello";
let y = x;
y = "world";

console.log(x);

✅ Сhoose the correct option 📝

🔎 Look for a hint:

1. 2 (bar and foo point to the same object)

2. [1, 2, 3, 4] (a and b point to the same array)

3. "hello" (strings are primitives, passed by value)


Explanation:
Objects and arrays are passed by reference, so bar.n changes foo.n, and b.push(4) changes a.
Primitive types (string, number, boolean) are passed by value, so changing y does not affect x.