Advanced JavaScript Unleashed: Master Advanced JavaScript Concepts like Prototypes, Symbols, Generators, and More

What is JavaScript....7 Course Overview....7 Prerequisites....7 Running code examples....8 Who is this course for?....8 History of JavaScript....9 Standardization of the JavaScript language....10 Ecma International, TC39....10 Proposals process....11 Track upcoming features....13 How is ECMAScript versioned?....13 JIT Compiler....15 JavaScript Engine....16 Types of execution contexts....21 Execution context phases....22 Stack overflow....35 Automatic garbage collection....37 Hoisting....38 “var” declarations....38 Function declarations....39 Function declarations inside blocks....40 Class declarations....44 Temporal Dead Zone (TDZ)....45 Function and class expressions....46 Common misconception about hoisting....47 Scope....49 Lexical scope....49 Avoid polluting the global scope....51 Implicit globals....52 Shadowing declarations....54 Function parameter scope....55 Function expression name scope....58 Block Scope....59 Module Scope....59 Scope Chain....60 Coercion....63 ToPrimitive....65 ToNumber....75 ToString....76 ToBoolean....77 Summary of abstract equality operator....78 Addition Operator....82 Relational operators....83 Closures....92 What is a closure?....92 How do closures work?....93 How are different scopes linked?....95 What causes this problem?....102 How to resolve this problem?....103 Prototypes....111 How are objects linked?....111 The “prototype” property....112 Getting prototype of any object....114 Object.prototype - parent of all objects....115 “Function” function....118 Problems with __proto__....121 Object.create method....123 Null prototype object....123 ES2015 classes....128 ‘this’ keyword....130 Function context....130 Global context....132 Constructor function context....133 Class context....133 DOM event handler context....134 Arrow functions to the rescue....138 Borrowing methods....142 Chain constructor calls....143 Revisit “this” problem....144 “this” vs globalThis....146 Symbol....149 Symbols and privacy....151 Adding a description to symbols....153 Symbol.toPrimitive....156 Symbol.toStringTag....156 Symbol.isConcatSpreadable....157 Asynchronous JavaScript....159 What does asynchronous mean?....159 Asynchronous JavaScript....160 Problems with callbacks....164 What is an event loop?....167 Promise states....172 Promise instance methods....173 Creating promises....176 Using promises with callback-based API....178 Promise specification....179 Promise vs thenable....179 then promise....182 catch promise....186 finally promise....190 Making sense of promise chaining....193 Rejection handler in then vs catch....202 Concurrent requests....203 Request timeout....204 async functions....208 await keyword....210 Multiple await expressions....212 Error handling....214 Returning vs awaiting promise....215 Awaiting non-promise value....219 Unnecessary use of the Promise Constructor....227 Incorrect Error Handling....228 Converting promise rejection into fulfillment....230 Async executor function....232 Iterators and Generators....234 Iterables....234 Iterators....235 Iterator prototype....237 Making custom iterable objects....239 Infinite sequence....242 Implementing iterators....243 Consuming values....244 Delegating to other iterators....246 Further reading....247 for await…of loop....251 Debugging JavaScript....252 Wrap up....261