What does the following ‘using’ and ‘Symbol.dispose’ pattern guarantee? class DbConnection { [Symbol.dispose]() { this.close(); } close() { /* cleanup */ } } { using conn = new DbConnection(); // use conn }

Explanation

The 'using' and 'Symbol.dispose' pattern in the DbConnection class guarantees that conn.close() is automatically called when the block exits, ensuring deterministic resource cleanup without needing try-finally blocks.

Key points

'Symbol.dispose' method is used for automatic resource cleanup
'using' pattern ensures conn.close() is called when block exits
Provides deterministic cleanup without try-finally blocks

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