Answer
Symbols are unique, immutable identifiers.
Used for private object keys or internal async state to avoid naming collisions.
Quick Answer
Symbols as async pattern keys: use Symbol() as unique event names in EventEmitters to avoid string collisions between libraries. Symbol.asyncIterator marks objects as async iterables. Symbol.toPrimitive controls async conversion. Private-by-convention class properties use Symbols as keys — not accessible via string keys or JSON serialization.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ