JS Tutorial 2: Variables and Data Types

🧩 #100DaysOfCode – Day 32 | JavaScript Variables & Data Types 💛 Moving deeper into JavaScript! 🚀 Today I learned about variables — the containers that hold data — and data types, which define what kind of value we store. 💡 🔑 Key Points: 🟢 var, let, const → used to declare variables. 💬 Data Types: String → "Hello" Number → 25 Boolean → true / false Array → [1, 2, 3] Object → {name: "Shalini", age: 19} 💡 “Variables are like storage boxes — label them right, and coding becomes smooth!” 🌸 #100DaysOfCode #Day32 #JavaScript #FrontendDevelopment #CodingJourney #LearnByDoing #WebDevelopment #WomenInTech

Day 12 of JS series - by Rohit Negi What I learned: ✅ forEach() – Iterates over every element in an array. ✅ filter() – Filters elements from an array based on a specific condition and returns a new array. ✅ map() – Transforms each element of an array and returns a new array. ✅ reduce() – Reduces an array to a single value (of any data type). ✅ Set – A data structure that stores unique values. ✅ Map – A data structure that stores key-value pairs, where both keys and values can be of any data type. #LearnInPublic #JavaScript #WebDevelopment 

🚀 𝗗𝗮𝘆 𝟮𝟯 𝗼𝗻 𝗟𝗲𝗲𝘁𝗖𝗼𝗱𝗲 Today I tackled one easy and one medium problem -- focusing on using objects to efficiently track array elements and their counts. 🧠 𝗜 𝘀𝗼𝗹𝘃𝗲𝗱: 🔹 1207. Unique Number of Occurrences 🔹 287. Find the Duplicate Number 💡 𝗞𝗲𝘆 𝘁𝗮𝗸𝗲𝗮𝘄𝗮𝘆: Objects can be super useful when you need to count, track, or compare array members efficiently. A solid step toward better data handling in JS 💪 #LeetCode #JavaScript #LearnInPublic #BuildInPublic #ProblemSolving #100DaysOfCode #WebDevJourney

JavaScript for 15 Days – Day 3: Data Types Every value in JavaScript has a data type, it tells the program what kind of data we’re working with. Today, you'll explore the difference between primitive and non-primitive data types, and how JavaScript uses them to store and process information. Primitive types: String, Number, Boolean, Null, Undefined, Symbol, BigInt Non-primitive types: Object, Array, Function Example 👇 let name = "Moussa"; // String let age = 27; // Number let skills = ["JS", "HTML", "CSS"]; // Array 💡 Lesson learned: Understanding data types makes debugging easier and helps you write cleaner, more reliable code. #JavaScript #FrontendDevelopment #WebDevelopment #CodingJourney #LearnToCode #15DaysJS #DevPerDay

Today I learned three powerful JavaScript methods: map(), filter(), and reduce() 🧠 These methods make working with arrays super efficient — instead of writing long loops, you can do everything in just a few lines of clean code! map() → transforms each element filter() → filters elements based on condition reduce() → reduces all elements into a single value (like sum or total) Learning how they work together really changed the way I think about data manipulation in JS 😍 #JavaScript #FrontendDevelopment #CodingJourney #WebDevelopment #LearningEveryday

#100DaysLearningChallenge with Saurabh Shukla Sir. 🎯 Day 19: Set in JavaScript — Ensuring Uniqueness and Efficiency 🔁✨ Yesterday, I worked with the Priority Queue, mastering how priorities influence data processing. Today, I explored another powerful built-in data structure — the Set — a simple yet efficient way to manage unique collections of values in JavaScript. 🧠 What’s a Set? A Set is a special type of collection that stores unique values, whether primitive types or object references. It automatically removes duplicates, making it a great tool for scenarios where uniqueness is essential. 🛠️ What I learned and implemented: ✅ Created and managed Sets to store unique data ✅ Added, deleted, and checked elements efficiently ✅ Explored key Set methods like add(), delete(), has(), and clear() ✅ Practiced converting between Arrays and Sets ✅ Used Sets to eliminate duplicates from arrays effortlessly 📂 Real-world use cases: ➡️ Removing duplicates from data collections ➡️ Managing unique user IDs or tokens ➡️ Tracking visited nodes in graph algorithms ➡️ Optimizing lookups and membership checks 👨💻 Sets may seem simple, but they play a crucial role in writing cleaner, faster, and more reliable code. 📒 Try creating your own examples — experiment with methods and combine Sets with other data structures for powerful results! 📹 Video reference (MySirG): https://lnkd.in/gfu-c8Tb 💻 Source Code (GitHub): https://lnkd.in/gStvbMtw 🚀 From managing priorities to maintaining uniqueness — every day, one concept stronger! #100DaysLearningChallenge #Day19 #Set #JavaScript #DataStructures #CleanCode #LearningInPublic #DevJourney #AlgoDaily #CodeSmart

🚀 Master JavaScript Arrays — From Basics to Advanced! Arrays are the backbone of data manipulation in JavaScript — from handling lists of items to building complex data structures. 📊 This guide covers everything you need to know — ✅ Creating, accessing, and modifying arrays ✅ Copying & cloning techniques (mutable vs. immutable) ✅ Modern methods like toReversed(), toSorted(), toSpliced(), and with() ✅ Deep dive into static & iterator methods (map, filter, reduce, find, flatMap, and more) ✅ Practical exercises and real-world challenges Whether you’re a beginner brushing up your fundamentals or an intermediate dev polishing your skills, this post is packed with examples and clear explanations to make Arrays second nature. 💪 📄 Download the full PDF below and start mastering one of the most powerful parts of JavaScript today. #JavaScript #FrontendDevelopment #WebDevelopment #Coding #Learning #Arrays #JSDeveloper

🚀 Master JavaScript Arrays — From Basics to Advanced! Arrays are the backbone of data manipulation in JavaScript — from handling lists of items to building complex data structures. 📊 This guide covers everything you need to know — ✅ Creating, accessing, and modifying arrays ✅ Copying & cloning techniques (mutable vs. immutable) ✅ Modern methods like toReversed(), toSorted(), toSpliced(), and with() ✅ Deep dive into static & iterator methods (map, filter, reduce, find, flatMap, and more) ✅ Practical exercises and real-world challenges Whether you’re a beginner brushing up your fundamentals or an intermediate dev polishing your skills, this post is packed with examples and clear explanations to make Arrays second nature. 💪 📄 Download the full PDF below and start mastering one of the most powerful parts of JavaScript today. #JavaScript #FrontendDevelopment #WebDevelopment #Coding #Learning #Arrays #JSDeveloper

🚀 Day 7 of My 30 Days of JavaScript Challenge 🧩 Problem: Array Reduce Transformation (LeetCode #2626) Given an integer array nums, a reducer function fn, and an initial value init, return the final reduced value. You must solve this without using the built-in Array.reduce() method. 💻 Language: JavaScript 📖 Problem Link: https://lnkd.in/eDiXhyPm 💡 Solution: https://lnkd.in/ezvK8_tY 🧠 Concepts Used Higher-order functions Accumulator pattern Sequential computation Understanding reduce() core logic 📚 Takeaway Rebuilding reduce() helps you understand how JavaScript aggregates data step by step. This concept is foundational for advanced topics like state management, data pipelines, and functional transformations. #Day7 #JavaScript #30DaysOfCode #LeetCode #WebDevelopment #FunctionalProgramming #CodingChallenge #FrontendDevelopment #100DaysOfCode