tc39/proposal-optional-chaining resource

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4909 stars · 70 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

The official TC39 ECMAScript proposal repository and spec text for the Optional Chaining operator (?.) in JavaScript, which reached Stage 4 and was merged into the language standard. It documents the motivation, syntax, and semantics of safe property access and optional method calls.

Use cases

• understand how the ?. optional chaining operator works in JavaScript
• read the official spec text for optional chaining semantics
• learn why user.address?.street is safer than user.address.street
• see how optional chaining interacts with nullish coalescing
• compare optional chaining syntax across languages like C# and Swift
• check edge cases like delete a?.b and forbidden write contexts

When to choose

• you need authoritative, normative spec details about ?. behavior
• you are implementing a JavaScript engine or transpiler
• you want the historical proposal document and prior-art comparison

When to avoid

• you want a tutorial or beginner-friendly guide to modern JavaScript
• you need a runnable library or tool rather than a specification
• you are looking for the already-shipped feature in a JS runtime

Facets

learning-resource · maturity stable

programming-language documentation programming-languages web-development cross-platform ecmascript tc39 language-proposal spec-text optional-chaining javascript-syntax javascript specifications web-server

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