Latest

• Prototypes as Instance of Type
• Closure Scopes Limit Closure Variables
• Function Name Bindings
• The debugger Statement
• Mixing class and function Constructors

Language Features

• Optional Chaining
• Nullish Coalescing Operator
• Default Function Parameters
• Reduce Code with Destructuring
• Variables in Strings with Template Literals
• Symbols for Safe Property Names
• Reduce Code with Object Shorthand Syntax
• Declarations let, const and class Can't be Redeclared
• typeof null === "object"
• Symbol.toStringTag
• Spreading Values
• Numeric Literal Formats
• Async Functions and await
• with Statements
• Accessor Properties (Getter/Setter)
• super in Object Literals
• Property Descriptors
• Default Parameters with Destructuring
• Symbol.species
• Proxy Objects
• Flattening Arrays
• globalThis
• Computed Properties
• Symbol.hasInstance
• Preventing Extensions in Objects
• What is a NaN?
• __proto__ in Object Literals
• Sealing Objects
• Negative Zero
• Freezing Objects
• Object Serialization With JSON
• Labels
• Custom Serialization With toJSON
• Trailing Commas
• JSON Reviver Function
• Function Name Bindings

Web API

• Detecting Dark Mode
• Event Attributes also Define Callback Functions
• addEventListener Options
• fetch is the new XMLHttpRequest
• setTimeout Callback Arguments
• Scrolling an Element into View
• Event Attribute Scopes
• Finding Elements in the DOM
• Live DOM Lists
• Easily Toggle HTML Classes
• Setting HTML Element Styles
• Entering Fullscreen
• The Window Proxy
• HTML ids Are Global
• Animations With requestAnimationFrame
• MutationObserver
• Canvas for Bitmaps

Classes/Constructors

• Overriding Constructor Returns
• super() Defines this
• New Functions With new
• Not All Functions Are Constructors
• Constructors Don't Need Parens
• The Deal With Prototypes
• Static Members Are Inherited
• When the constructor Property Matters
• Constructor Internals
• A Function's Home Object
• Mixing class and function Constructors

Generators and Iterators

• Generators for Iterables
• Create Iterable Objects
• Generating Ranges
• The Iterator Protocol
• Interacting With Generators
• Yield Many With yield*
• Generator Prototypes
• Using Generators to Animate

How Tos

• Is it an Array?
• Format Time Strings with Padding
• Chaining
• Using Destructuring to Swap Values
• A Custom Self-rejecting Promise
• Filter and Map With flatMap
• Mixins
• Time-based requestAnimationFrame
• Copying Accessor Properties

Miscellaneous

• Thenable Objects
• Internal Slots
• Missing Semicolon ASI Gotchas
• Hoisting
• The Return of ASI
• Exotic Objects
• Array-likes
• Define vs. Assign
• What Uses enumerable?
• Variable Shadowing
• Awaiting Non-promises
• Global Object vs. Global Declarations
• Promises Block Rendering
• Parameters are Reference Variables
• Kinds of Comparisons
• The Underscore Convention
• String Conversions in Depth
• Closure Scopes Limit Closure Variables
• Prototypes as Instance of Type

Tooling

• JavaScript with Types: TypeScript
• JavaScript Outside the Browser: Node
• Expandable Logs With console.dir
• Detect Errors Early With Linting
• Stylish Logs
• JSFuck
• Console $ Utilities
• The debugger Statement