DocumentationHackReferenceClassHH\VectoraddAllKeysOf

HH\Vector::addAllKeysOf

Adds the keys of the specified container to the current Vector

public function addAllKeysOf(
  ?KeyedContainer<Tv, mixed> $container,
): Vector<Tv>;

For every key in the provided KeyedContainer, append that key into the current Vector, assigning the next available integer key for each.

Future changes made to the current Vector ARE reflected in the returned Vector, and vice-versa.

Parameters

?KeyedContainer<Tv,mixed> $container - The KeyedContainer with the new keys to add.

Returns

Vector<Tv> - Returns itself.

Examples

This example adds string keys from a Map to a Vector as its values:

$fruit_calories = Map {
  'apple' => 95,
  'orange' => 45,
};

$vegetable_calories = darray[
  'cabbage' => 176,
  'potato' => 163,
];

$food_names = Vector {};

// Add the keys from a Map
$food_names->addAllKeysOf($fruit_calories);

// Add the keys from an associative array
$food_names->addAllKeysOf($vegetable_calories);

\var_dump($food_names);

This example adds int keys from a Map to a Vector as its values:

$uploaders_by_id = Map {
  4993063 => 'Amy Smith',
  9361760 => 'John Doe',
};

$commenters_by_id = darray[
  7424854 => 'Jane Roe',
  5740542 => 'Joe Bloggs',
];

$all_ids = Vector {};

// Add the keys from a Map
$all_ids->addAllKeysOf($uploaders_by_id);

// Add the keys from an associative array
$all_ids->addAllKeysOf($commenters_by_id);

\var_dump($all_ids);