Sqrt

:::info[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 the square root of $arg

namespace HH\Lib\Math;

function sqrt(
  num $arg,
): float;

Parameters

• num $arg

Returns

• float