HH\ImmVector::at

Returns the value at the specified key in the current ImmVector

public function at(
  int $key,
): Tv;

If the key is not present, an exception is thrown. If you don't want an exception to be thrown, use get() instead.

$v = $vec->at($k) is semantically equivalent to $v = $vec[$k].

Parameters

• int $key

Returns

• Tv - The value at the specified key; or an exception if the key does not exist.

Examples

See [Vector::at](</hack/reference/class/Vector/at/#examples>) for usage examples.