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isEmpty

Note

This is a point-in-time snapshot of the API documentation from January 2026. Going forward, we will not be maintaining a public copy of these references, and recommend users to refer to the built-in signature helpers available in the Hack LSP instead for complete and up-to-date information.

Checks if the current ImmSet is empty

public function isEmpty(): bool;

Returns​

  • bool - true if the current ImmSet is empty; false otherwise.

Examples​

See Set::isEmpty for usage examples.