Learning JavaScript Functions Fundamentals

🚀 Day 12 of My JavaScript Learning Journey Today I learned about Arrays and Array Methods in JavaScript — one of the most essential concepts for handling data. 📌 What I learned: 🔹 What is an Array? • A collection of elements stored in a single variable • Zero-indexed (starts from 0) 🔹 Ways to Create an Array • Using array literal → [1, 2, 3] • Using constructor → new Array() 🔹 Adding & Removing Elements • push() / unshift() → Add elements • pop() / shift() → Remove elements 🔹 Important Array Methods • map() → Transform elements • filter() → Select specific elements • reduce() → Convert array into a single value 🔹 Searching & Utility Methods • find() / includes() • forEach() → Iterate elements • slice() / splice() → Extract or modify array 💡 Arrays are powerful because they allow us to store, manipulate, and process data efficiently. ⚙️ I also practiced real examples like transforming arrays using map() to create new values. Step by step, I’m improving my problem-solving skills and JavaScript fundamentals. 💻✨ #JavaScript #WebDevelopment #FrontendDevelopment #CodingJourney #LearningInPublic #100DaysOfCode #DeveloperJourney #ProgrammingBasics

🚀 Day 14 of My JavaScript Learning Journey Today I learned about JavaScript Objects — Access, Add, Update & Delete properties. 📌 Key concepts I explored: 🔹 What is an Object? • A collection of key-value pairs • Used to store structured data Example: let user = { name: "Sanjay", age: 21 }; 🔹 Accessing Object Data • Dot Notation → user.name • Bracket Notation → user["age"] 💡 Bracket notation is useful when keys are dynamic or contain special characters. 🔹 Modifying Objects • Add → user.city = "Bangalore" • Update → user.age = 22 🔹 Deleting Properties • Use delete keyword Example: delete user.city; 🔹 Important Insight • Objects are mutable, meaning they can be changed after creation 💡 Understanding objects is essential because they are widely used to represent real-world data in applications. Step by step, I’m improving my JavaScript fundamentals and practical coding skills. 💻✨ #JavaScript #WebDevelopment #FrontendDevelopment #CodingJourney #LearningInPublic #100DaysOfCode #DeveloperJourney #ProgrammingBasics

🚀 Day 3 of My JavaScript Learning Journey Today I explored some core concepts of JavaScript that every beginner must understand — and honestly, things are starting to make more sense now! 🔢 1. Numbers in JavaScript JavaScript has only one type for numbers — no separate integer or float. Example: 10 / 20 = 0.5 Even though both are integers, the output is a decimal. Simple but powerful! ✅ 2. Boolean Logic Understanding true/false conditions: 3 >= 3 → true 2 >= 3 → false Also learned something interesting 👇 Expressions are evaluated left to right: 1 >= 0 <= 5 < 6 >= 0 → true 🔄 3. Typecasting == → checks only value === → checks value + type This small difference can save you from big bugs! ⚡ 4. Logical Operators & Short Circuiting || (OR) → if any condition is true && (AND) → all conditions must be true ! (NOT) → reverses the result 👉 Short Circuiting: As soon as JavaScript gets the result, it stops checking further. Example: let marks = 45; let attendance = 60; if (marks >= 33 || attendance >= 75) { console.log("You are pass"); } else { console.log("Fail"); } 💡 Even if one condition is true, it won’t check the next! 🧵 5. Strings & Template Literals Instead of messy concatenation, we can use template literals: let naam = "Surbhi"; let kaam = "Web Developer"; let shaher = "Gurgaon"; let output = `Hi, I am ${naam}, a ${kaam} in ${shaher}`; Clean, readable, and modern ✨ 📌 Small steps every day… but building strong foundations! #javascript #codingjourney #webdevelopment #learninginpublic

🚀 Day 11 of My JavaScript Learning Journey Today I learned about JavaScript Scopes and Function Execution Context (FEC) — a core concept to understand how JavaScript manages variables and executes code. 📌 Key concepts I explored: 🔹 Scopes in JavaScript • Global Scope – Variables accessible throughout the program • Local Scope – Variables accessible within a function • Block Scope – Variables declared with let and const inside {} 🔹 Key Difference • var → Function scoped • let & const → Block scoped 🔹 Function Execution Context (FEC) Every time a function is called, JavaScript creates a new execution context. ⚙️ FEC Lifecycle: 1️⃣ Memory Creation Phase • Variables are hoisted and initialized • Functions are stored in memory 2️⃣ Execution Phase • Code runs line by line • Variables get their actual values 🔹 FEC Components • Variable Environment • Scope Chain (access to outer scope) • this keyword 💡 Understanding scopes and execution context helps in writing efficient, bug-free, and optimized JavaScript code. Step by step, I’m strengthening my JavaScript fundamentals and internal working knowledge. 💻✨ #JavaScript #WebDevelopment #FrontendDevelopment #CodingJourney #LearningInPublic #DeveloperJourney #ProgrammingBasics

🚀 Learning Update | JavaScript Internals & Async Mastery Here’s what I worked on recently: 🔹 Core Concepts (MDN Deep Dive) Studied the JavaScript Event Loop and Promises to build a strong conceptual foundation. 🔹 Custom Promise Implementation Implemented a Promise from scratch, including: • Constructor & executor • resolve/reject handling • Promise chaining 🔹 Utility Methods Built custom implementations of: • Promise.all() • Promise.race() • Promise.allSettled() 🔹 Testing & Edge Cases Wrote comprehensive test cases covering: • Promise chaining • Error handling • Race conditions 🔹 Learning by Teaching 🎥 Recorded a video explaining Promises & Event Loop with practical code examples. 🔹 Code Sharing Pushed the complete implementation to GitHub with detailed comments for better readability and understanding. 🔹 Communication Improvement Continued reading The Power of Subconscious Mind to enhance clarity and communication 🧠 Diving deeper into fundamentals to build stronger systems thinking. #JavaScript #AsyncProgramming #NodeJS #WebDevelopment #LearningInPublic #GrowthMindset

Day 07 of My JavaScript Learning 👉 Finding the largest among three numbers How to compare multiple values using if-else Writing clean and readable conditions Converting logic into a reusable function // Find the largest among 3 numbers let firstNum = 5; let secondNum = 10; let thirdNum = 2; if (firstNum >= secondNum && firstNum >= thirdNum) { console.log(firstNum); } else if (secondNum >= firstNum && secondNum >= thirdNum) { console.log(secondNum); } else { console.log(thirdNum); } 🔁 Making it reusable with a function: let largestInFunction = function(firstNum, secondNum, thirdNum) { if (firstNum >= secondNum && firstNum >= thirdNum) { return firstNum; } else if (secondNum >= firstNum && secondNum >= thirdNum) { return secondNum; } else { return thirdNum; } } console.log(largestInFunction(3, 1, 4)); 🌱 My takeaway: Even simple problems help build strong fundamentals. The goal is not just solving — but understanding the logic behind it. #Day07 #JavaScript #LearningJourney #FrontendDeveloper #CodingPractice

Day 4 of my JavaScript learning journey 🚀 Yesterday was all about building a strong foundation by understanding some core JavaScript concepts: 🔹 Introduction to JavaScript Got a clearer picture of how JavaScript powers interactivity on web pages and why it's such an essential language for developers. 🔹 Variables in JavaScript Learned how to store and manage data using: - var – function-scoped and the old way of declaring variables - let – block-scoped and more flexible - const – block-scoped and used for values that shouldn’t change 🔹 JavaScript Output Methods Explored different ways to display data: - "console.log()" – for debugging in the console - "document.write()" – directly writing to the webpage - "alert()" – showing pop-up messages - "prompt()" – taking user input 🔹 JavaScript Data Types Understood how data is categorized: - Primitive Types – string, number, boolean, null, undefined, symbol, bigint - Non-Primitive Types (Important) – objects, arrays, and functions It’s amazing to see how these basic concepts connect and form the backbone of everything we build in JavaScript. Looking forward to diving deeper and building more 🚀 #JavaScript #WebDevelopment #LearningJourney #Day4 #Coding

🚀 Day 13 of My JavaScript Learning Journey Today I learned about Looping Through Arrays in JavaScript and different ways to iterate over data efficiently. 📌 Key concepts I explored: 🔹 Manual Iteration • for...in → Iterates over indexes • for...of → Iterates over values directly 💡 Best Practice: Avoid using for...in for arrays. Prefer for...of for better readability and reliability. 🔹 Functional Iteration • forEach() → Executes a function for each element • Clean and modern way to write iteration logic Example: arr.forEach((value, index) => { console.log(value, index); }); 🔹 Quick Comparison • for...in → Returns index • for...of → Returns value • forEach() → Uses function (modern approach) 💡 Understanding iteration helps in writing clean, efficient, and readable code, especially when working with large datasets. Step by step, I’m improving my JavaScript fundamentals and coding logic. 💻✨ #JavaScript #WebDevelopment #FrontendDevelopment #CodingJourney #LearningInPublic #DeveloperJourney #ProgrammingBasics

Day 9 of My JavaScript Journey 🚀 Today, I continued learning about functions in JavaScript. I explored: • Function expressions: This is a function stored inside a variable • Arrow functions: This is a shorter and cleaner way to write functions, especially for simple one-line operations Example: const add = (a, b) => a + b; One important concept I understood: All functions, no matter how they are written, follow the same process: Receive input (parameters), Transform the data, and Return an output This made things much clearer for me. Key takeaway: Different function styles exist, but they all serve the same purpose making code reusable and organized. #JavaScript #WebDevelopment #LearningInPublic #100DaysOfCode

Day 8 of My JavaScript Journey 🚀 Today, I started learning about functions in JavaScript. Functions are used to group and reuse code, making programs more organized and efficient. There are three types of functions: • Function declaration • Function expression • Arrow function Today, I focused on function declaration. Example: function greet(name) { return "Hello " + name; } One thing I noticed: Functions can feel a bit difficult at first, but they are a core part of JavaScript. So instead of rushing, I’m taking my time to truly understand how they work. Key takeaway: Mastering functions is essential because they are used everywhere in JavaScript. #JavaScript #WebDevelopment #LearningInPublic #100DaysOfCode