DocumentationHackReferenceClassHH\VectorlastValue

HH\Vector::lastValue

Returns the last value in the current Vector

public function lastValue(): ?Tv;

Returns

?Tv - The last value in the current Vector, or null if the current Vector is empty.

Examples

This example shows how lastValue() can be used even when a Vector may be empty:

function echoLastValue(Vector<string> $v): void {
  $last_value = $v->lastValue();
  if ($last_value !== null) {
    echo 'Last value: '.$last_value."\n";
  } else {
    echo 'No last value (Vector is empty)'."\n";
  }
}

<<__EntryPoint>>
function basic_usage_main(): void {
  // Will print "Last value: yellow"
  echoLastValue(Vector {'red', 'green', 'blue', 'yellow'});

  // Will print "No last value (Vector is empty)"
  echoLastValue(Vector {});
}