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slice

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.

Returns a subset of the current ConstVector starting from a given key up to, but not including, the element at the provided length from the starting key

public function slice(
  int $start,
  int $len,
): ConstVector<Tv>;

$start is 0-based. $len is 1-based. So slice(0,2) would return the elements at key 0 and 1.

The returned ConstVector will always be a proper subset of this ConstVector.

Parameters​

  • int $start - The starting key of this Vector to begin the returned ConstVector.
  • int $len - The length of the returned ConstVector.

Returns​