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add

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.

Add a value to the collection and return the collection itself

public function add(
  Te $e,
): this;

It returns the current collection, meaning changes made to the current collection will be reflected in the returned collection.

Parameters​

  • Te $e - The value to add.

Returns​

  • this - The updated collection itself.