HH\Vector::containsKey

Determines if the specified key is in the current Vector

Description

public function containsKey<Tu super int>(
  Tu $k,
): bool

Parameters

  • Tu $k

Return Values

  • bool - true if the specified key is present in the current Vector; returns false otherwise.

Examples

<?hh

namespace Hack\UserDocumentation\API\Examples\Vector\ContainsKey;

$v = Vector {'red', 'green', 'blue', 'yellow'};

// Prints "true", since index 0 is the first element
var_dump($v->containsKey(0));

// Prints "true", since index 3 is the last element
var_dump($v->containsKey(3));

// Prints "false", since index 10 doesn't exist
var_dump($v->containsKey(10));
Output
bool(true)
bool(true)
bool(false)