HH\Lib\C\nfirst

This API is part of the Hack Standard Library, not HHVM itself.
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This function is available as C\nfirst() in Facebook's www repository.

Returns the first element of the given Traversable, or null if the Traversable is null or empty

Description

namespace HH\Lib\C;

function nfirst<T>(
  ?Traversable<T> $traversable,
): ?T;

For non-null Traversables, see C\first. For non-empty Traversables, see C\firstx. For single-element Traversables, see C\onlyx.

Parameters

  • ?Traversable<T> $traversable