tc39/proposal-nullish-coalescing resource

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1226 stars · 21 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

The TC39 specification repository for the ECMAScript nullish coalescing operator (??), a Stage 4 language proposal that provides default values only when a value is null or undefined. It contains the proposal explainer, motivation, syntax examples, and the formal specification draft.

Use cases

• understand how the ?? operator works in javascript
• learn difference between ?? and || for default values
• read the ecmascript spec for nullish coalescing
• find examples of nullish coalescing operator usage
• check status of the tc39 nullish coalescing proposal

When to choose

• you need authoritative semantics of the ?? operator
• you want to understand why || mishandles falsy values like 0 or ''
• you're implementing a javascript engine or transpiler

When to avoid

• you want a library or tool to install
• you need general javascript tutorials rather than language specification
• you're looking for optional chaining documentation specifically

Facets

learning-resource · maturity maintenance

programming-language documentation programming-languages web-development browser cross-platform ecmascript tc39 language-proposal specification nullish-coalescing javascript-operator javascript specifications nodejs

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