tc39/ecma262

Features

• Formal Grammar Specifications - Defines the formal grammar and algorithmic prose that establish the language's syntax and semantics.
• Language Specifications - Provides the formal standard defining the syntax, semantics, and execution model for all JavaScript implementations.
• Language Specifications - Provides the formal documents and standards that define the syntax, behavior, and implementation of the JavaScript language.
• Algorithmic Prose Definitions - Defines language semantics using a combination of context-free grammar and step-by-step algorithmic descriptions.
• Technical Governance Frameworks - Implements a structured process for managing technical proposals and design decisions via a committee of delegates.
• Atomic Memory Operations - Provides indivisible read-modify-write operations on shared memory to synchronize state across agents.
• Agent-Based Concurrency Models - Defines the formal model for coordinating multiple execution contexts using shared memory and atomic operations.
• Object Prototypes - Implements the core prototype-based inheritance model for object creation and shared behavior.
• Generator Functions - Defines generator functions that can pause execution and yield values incrementally.
• Language Specifications and Standards - Provides the formal definitions and evolution roadmaps that govern the structure and maintenance of the language.
• Numeric Computation Execution - Executes arithmetic and bitwise operations across different number types without implicit conversion.
• Object Property Accessors - Defines the fundamental mechanisms for associating keys with data or accessors to manage object state.
• Prototype-Based Inheritance - Implements a prototype-based inheritance system where objects share behavior via a prototype chain.
• Promise-Based Computation Management - Represents the eventual completion or failure of deferred operations using standard promise objects.
• Proposal Lifecycles - Advances language features through numbered maturity stages, each requiring specific deliverables and committee consensus before progression.
• Scheduling Loops - Defines the scheduling loop that enqueues and executes computations when the execution stack is empty.
• Textual Data Management - Defines the core mechanisms for representing and manipulating textual information via 16-bit unsigned integers.
• Type Conversions - Defines standard operations for transforming values between boolean, number, string, and object types.
• Value Identity Determination - Implements algorithms for determining value identity, handling special cases like NaN and signed zeros.
• Committee Governance Models - Provides a consensus-driven model for managing proposal ownership, reviewer sign-offs, and advancement stages.
• Standardization Lifecycles - Manages the formal lifecycle of language features from initial design to final adoption in the standard.
• Governance Models - Establishes the consensus-driven processes and collaborative decision-making frameworks for managing the language specification.
• Governance Proposal Lifecycles - Manages the process of determining if a proposal is ready to advance to the next maturity stage.
• Consensus-Based Resolution - Resolves specification changes and proposal transitions through delegate discussion and formal agreement in TC39 meetings.
• Expert Reviewer Sign-offs - Designates independent experts to review specification text and provide sign-off before a proposal advances.
• Proposal Lifecycle Management - Implements a structured lifecycle for tracking technical proposals from drafting through committee approval.
• Proposal Champions - Assigns a designated delegate to shepherd proposals through authoring and committee presentation.
• Unique Property Keys - Defines the creation of unique, immutable symbols to serve as non-colliding object property keys.
• Binary Data Accessors - Provides views that allow reading and writing multiple numeric types directly to an underlying binary buffer.
• Collection Iteration - Defines synchronous and asynchronous interfaces for producing sequences of values from objects.
• Dynamic Array Management - Manages indexed collections with dynamic lengths and standard methods for sorting and transforming elements.
• JSON Processing - Provides built-in capabilities to convert data between standard values and JSON formatted strings.
• Documentation Build Pipelines - Ships a toolchain to automate the generation of the specification from source files into a rendered document.
• Specification Renderers - Implements a build pipeline that compiles formal grammar and algorithmic prose into a rendered document.
• Function Context Binding - Defines the mechanism for fixing the this value of a function to maintain a consistent object context.
• Function Objects - Defines callable objects that can be invoked as functions using a specified context and arguments.
• Garbage Collection Callbacks - Implements a standard for associating cleanup callbacks with objects to run after they are garbage collected.
• Meta-Programming Interceptors - Provides a formal model for intercepting and customizing default object operations using handler objects.
• Object Liveness Analysis - Defines the criteria for identifying if objects or symbols remain live and observable during execution.
• Strict Mode Enforcement - Enforces stricter parsing and error handling rules through a language-level directive to improve security.
• Weak Collections - Defines data structures and references that allow objects to be garbage collected even when referenced.
• Documentation-as-Code Systems - Provides a toolchain that treats the formal specification as code, compiling it into a rendered technical document.

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