60 Days of JavaScript: A Complete Journey from Beginner to Intermediate

Today marks the end of my 60-day technical writing project on JavaScript 🎉. Over the past two months, I’ve taken a deep dive into one of the most popular programming languages in the world, exploring its syntax, logic, structure, and real-world applications.

This journey began with the basics, including understanding what JavaScript is and how it works, and gradually expanded into more advanced concepts, such as asynchronous programming, DOM manipulation, and ES6+ features.

In this article, I’ve gathered all 59 topics I’ve covered so far, each with a brief overview and a direct link to the full guide. Whether you’re a beginner or an intermediate developer looking to strengthen your JavaScript knowledge, this collection will serve as a complete learning roadmap.

Day 1: What is JavaScript? (Client-side vs Server-side)

An introduction to what JavaScript is, how it functions in both client and server environments, and why it’s essential for modern web development. Read more

Day 2: Understanding Statements vs. Expressions in JavaScript

Learn the difference between statements and expressions and how they define JavaScript’s flow and logic. Read more

Day 3: How to Write Effective Comments in JavaScript Code

Discover how to use comments effectively to make your code cleaner, readable, and maintainable. Read more

Day 4: JavaScript Variables and Scope: A Complete Beginner’s Guide

Understand variable declarations, scoping rules, and best practices for managing data in your code. Read more

Day 5: JavaScript Operators Explained

Learn about arithmetic, comparison, logical, and assignment operators to handle calculations and logic in JavaScript. Read more

Day 6: Mastering JavaScript Control Flow: If-Else and Switch Explained

Explore how JavaScript makes decisions using if-else and switch statements. Read more

Day 7: JavaScript Loops Explained: For, While, and More

Learn how loops help execute repetitive tasks efficiently in JavaScript. Read more

Day 8: Understanding Break and Continue in Control Flow

Understand how to skip or stop loop iterations with break and continue. Read more

Day 9: Understanding JavaScript Functions: Function Declarations vs Expressions

Learn the difference between function declarations and expressions, and when each should be used. Read more

Day 10: Mastering Arrow Functions (=>) in JavaScript

A beginner’s guide to ES6 arrow functions and how they simplify code syntax. Read more

Day 11: Understanding Parameters vs Arguments in JavaScript

Learn how data is passed and used inside functions with parameters and arguments. Read more

Day 12: JavaScript Function Return Statement

Explore how functions return values and how to use return statements effectively. Read more

Day 13: JavaScript Default Parameters

Understand how default parameters make functions more flexible and error-proof. Read more

Day 14: Understanding JavaScript Rest and Spread Operators

Learn how rest and spread operators simplify working with arrays and objects. Read more

Day 15: Understanding Callback Functions in JavaScript

Master asynchronous logic with callback functions. Read more

Day 16: Understanding Recursion in JavaScript

A guide to how functions can call themselves to solve complex problems. Read more

Day 17: JavaScript Object Literals Explained

Learn how to define and use objects in JavaScript to store structured data. Read more

Day 18: Accessing & Modifying Object Properties in JavaScript

Understand how to retrieve and modify data inside objects dynamically Read more

Day 19: Understanding Nested Objects in JavaScript

Explore how to work with multi-level objects and access deep data Read more

Day 20: JavaScript Arrays Explained: Creation, Indexing, and Common Methods

Get familiar with creating arrays, accessing their element, and using built-in methods like push(), pop(), and map() to manage data easily. Read more

Day 21: How to Loop Through Arrays and Objects in JavaScript (With Examples)

Discover how to use loops like for, forEach, and for...in to process arrays and objects efficiently. Read more

Day 22: Mastering Destructuring in JavaScript: Objects and Arrays Made Simple

Understand how to extract values from objects and arrays with ease using destructuring. Read more

Day 23: JavaScript DOM: A Beginner’s Guide to Selecting HTML Elements

Explore how to access and interact with elements in the DOM through functions like getElementById() and querySelector(). Read more

Day 24: JavaScript DOM Manipulation: How to Change Website Content Dynamically

See how to update website text, images, and structure using JavaScript DOM manipulation techniques. Read more

Day 25: JavaScript DOM: A Beginner’s Guide to Changing Styles and Classes

Understand how to modify CSS styles and toggle classes with JavaScript to make interactive designs. Read more

Day 26: JavaScript DOM Manipulation: How to Create and Remove HTML Elements Dynamically

Discover how to add and remove elements from HTML in real time for dynamic web experiences. Read more

Day 27: JavaScript DOM Event Handling: How to Use addEventListener for Beginners

Master how to respond to user actions like clicks and key presses using event listeners. Read more

Day 28: JavaScript Form Handling and Validation: A Complete Guide

Discover how to capture user input, validate data, and prevent invalid form submissions. Read more

Day 29: JavaScript Scope and Closures Explained

Understand how variable scope works and how closures preserve access to data in nested functions. Read more

Day 30: JavaScript Hoisting Explained

Learn how JavaScript moves variable and function declarations to the top during execution. Read more

Day 31: JavaScript ‘this’ Keyword Explained

Understand how this behaves differently depending on how a function is called. Read more

Day 32: JavaScript Execution Context and Call Stack Explained

Learn how JavaScript runs your code step by step using the call stack and execution context. Read more

Day 33: Understanding Lexical Environment in JavaScript

See how variable environments are created and how JavaScript looks up variable references. Read more

Day 34: JavaScript Strict Mode Explained

Explore how 'use strict' makes your code safer and helps catch common errors. Read more

Day 35: Let vs Const in JavaScript

Understand the differences between let and const and learn when to use each. Read more

Day 36: JavaScript Template Literals Explained

Learn how to use template literals for cleaner string formatting with backticks and expressions. Read more

Day 37: Mastering JavaScript Destructuring in ES6+

Simplify your code using modern destructuring techniques for arrays and objects. Read more

Day 38: JavaScript Spread and Rest Operators Explained

Discover how to combine, copy, or separate values easily using spread and rest syntax. Read more

Day 39: JavaScript Arrow Functions Explained

Understand how arrow functions provide a shorter syntax and lexical this binding. Read more

Day 40: JavaScript ES6 Modules Explained

Learn how to organize and reuse code using import and export statements. Read more

Day 41: JavaScript Classes and Inheritance Explained

Understand how to create classes and use inheritance for object-oriented programming. Read more

Day 42: JavaScript Promises and Async/Await Explained

Learn how JavaScript handles asynchronous code with promises and async functions. Read more

Day 43: JavaScript Try...Catch Explained

Discover how to handle runtime errors gracefully using try...catch Read more

Day 44: JavaScript Custom Errors Explained

Learn to build and trigger your own custom error messages for clearer debugging insights. Read more

Day 45: JavaScript Finally Block Explained

Understand how the finally block ensures cleanup runs after try...catch. Read more

Day 46: Understanding Callbacks in JavaScript

A simple introduction to asynchronous programming with callback functions. Read more

Day 47: From Callbacks to Promises

See how JavaScript evolved from callbacks to promises for better async flow. Read more

Day 48: Understanding Async/Await in JavaScript

Simplify asynchronous code with async/await syntax for cleaner and more readable logic. Read more

Day 49: How to Use setTimeout and setInterval in JavaScript

Learn how to execute code after a delay or repeatedly using timing functions. Read more

Day 50: How to Use the Fetch API in JavaScript

Understand how to make HTTP requests and fetch data from APIs. Read more

Day 51: How to Handle JSON Data in JavaScript

Learn to parse, stringify, and manage JSON data when working with APIs in JavaScript. Read more

Day 52: Understanding Truthy and Falsy Values in JavaScript

Understand how JavaScript evaluates conditions based on truthy and falsy values. Read more

Day 53: Understanding Type Coercion in JavaScript

Learn how JavaScript converts data types automatically during operations. Read more

Day 54: Understanding the Event Loop and Concurrency in JavaScript

Explore how JavaScript handles asynchronous code with its event loop system. Read more

Day 55: Understanding Debounce and Throttle in JavaScript

Learn how to optimize performance and control function calls efficiently. Read more

Day 56: Understanding Local Storage and Session Storage in JavaScript

Discover how to store and retrieve data locally in the browser. Read more

Day 57: Understanding Date and Time Methods in JavaScript

Master how to create, read, and format dates and times using JavaScript’s Date object. Read more

Day 58: Understanding Regular Expressions in JavaScript

Learn how to find patterns and validate text efficiently with Regex Read more

Day 59: Understanding the Math Object and Utility Functions in JavaScript

Explore how JavaScript’s Math object provides tools for calculations, rounding, and random values. Read more

Conclusion

Reaching this milestone of 60 days of technical writing on JavaScript is more than just an achievement; it’s proof that consistency leads to mastery.

Each article built upon the previous one, covering everything from core fundamentals to advanced ES6 concepts. For anyone beginning their JavaScript journey, this 60-day roadmap provides a clear, structured path to understanding and applying JavaScript effectively.

This marks the end of my beginner-to-intermediate JavaScript series, but not the end of my learning journey. The next phase is focused on building real-world projects and sharing even deeper insights about React.js, APIs, and modern web development.

Stay tuned, and keep coding!💻

You can reach out to me via LinkedIn