Table of contents : Introduction to JavaScript Fundamentals Core Principles and Fundamentals of JavaScript Chrome DevTools Accessing DevTools Understanding the Output of a Code Snippet Understanding console.log(1 + "2" + 3) Output Interpreting the Result of an Expression Deciphering JavaScript Code Output The Significance == Operator for Equality Differences Between == and === The Return Value of typeof null Distinguishing Between null and undefined Spreading a Set into an Array Concept of Hoisting in JavaScript The Role of the void Operator Rounding a Number to Two Decimal Places Checking if a Number is Finite and Not NaN Detecting a User's Device Type Declaring an Immutable Variable with ES6 Checking for a Property in an Object Exercise Answers the following Questions JavaScript Fundamentals Quiz Asynchronous JavaScript Introduction to Asynchronous JavaScript Simplifying Asynchronous Code async/await The Role of Promise.all Code After Multiple Asynchronous Operations Enabling Asynchronous Features async Keyword Rejected Promises async Throws an Error Handling Asynchronous Functions Internally Exercise Answers the following Questions Asynchronous JavaScript Quiz Error Handling and Object Configuration Write cleaner more reliable code The Role of the finally Block in Error Handling The finally Clause in a Promise Chain The Effect of Object.seal on an Object Exercise Answers the following Questions Error Handling Object Config Quiz Functions and Scoping Introduction to Functions and Scoping Understanding JavaScript Closures Debouncing a Function Call The this Keyword in Different Contexts Using the bind Method Capturing Click Events Across the Document Delaying Function Execution One-Time Event Listeners Running JavaScript on Input Change Stopping setInterval() Exercise Answers the following Questions Functions and Scoping Quiz Data Structures and Types Prototype Inheritance in JavaScript Purpose of the Set Object Removing Duplicates from an Array Benefits of Set Over an Array for Unique Values Understanding NaN in JavaScript Difference Between null and undefined The reduce() Method The flatMap() Method Use Case for the Symbol.iterator Property Difference Between slice and splice The every() Method The map() Method Use Case for the some() Method Concatenating Arrays Creating a New Date Object Transforming Array Values Accumulating Results Exercise Answers the following Questions Data Structures and Types Quiz Modules and ES6 Features JavaScript Modules and ES6 Features JavaScript Modules: An Overview Dynamic Imports in JavaScript Default Behavior of Import Statement Correctly Include Your JavaScript as a Module Achieving Module Encapsulation in JavaScript ES6 Dynamic Importing of Modules Purpose of Template Literals in JavaScript Exercise Answers the following Questions Modules and ES6 Quiz Object Manipulation Iteration Mastering Object Manipulation and Iteration Object Manipulation and Iteration in JavaScript Creating a Deep Copy of an Object Working with WeakMaps for Private Data Iterating Over Object Properties Creating Private Variables and Methods in Classes Converting a NodeList to an Array Deeply Cloning Objects with Circular References Defining Non-enumerable Properties Cloning an Object Excluding Certain Properties Exercise Answers the following Questions Object Manipulation and Iteration Quiz Event Handling and the DOM Navigating Event Handling DOM Manipulation Event Handling and the DOM in JavaScript Event Delegation Pattern Event Propagation Explained Preventing Form Submission Stopping Event Propagation Stopping a CSS Animation Removing a Specific Element from the DOM Document Completely Loaded Event Exercise Answers the following Questions Event Handling and DOM Quiz Promises and Async/Await Mastering Asynchronous JavaScript JavaScript Promises: An Overview The Async Keyword Executing Code After a Delay The Promise.race() Method Promises and Async/Await Exercise Answers the following Questions Async and Await Quiz Advanced Topics Advanced Topics in JavaScript Handling Integer Overflow Garbage Collection and Circular References The Event Loop Module Scoping Promise.allSettled() Method Detecting Arrays The Static Keyword in Classes Detecting Strict Mode Exercise Answers the following Questions Advanced JavaScript Topics Quiz Test Your Knowledge JavaScript Quiz Acknowledgments About the Author