PHP code example of hiqdev / hoa-iterator

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

    

hiqdev / hoa-iterator example snippets

$foobar = new Hoa\Iterator\Map(['f', 'o', 'o', 'b', 'a', 'r']);

foreach ($foobar as $value) {
    echo $value;
}

/**
 * Will output:
 *     foobar
 */

$filter = new Hoa\Iterator\CallbackFilter(
    $foobar,
    function ($value, $key, $iterator) {
        return false === in_array($value, ['a', 'e', 'i', 'o', 'u']);
    }
);

foreach ($filter as $value) {
    echo $value;
}

/**
 * Will output:
 *     fbr
 */

$limit = new Hoa\Iterator\Limit($foobar, 2, 3);

foreach ($limit as $value) {
    echo $value;
}

/**
 * Will output:
 *     oba
 */

$infinite = new Hoa\Iterator\Infinite($foobar);
$limit    = new Hoa\Iterator\Limit($infinite, 0, 21);

foreach ($limit as $value) {
    echo $value;
}

/**
 * Will output:
 *     foobarfoobarfoobarfoo
 */

$repeater = new Hoa\Iterator\Repeater(
    $foobar,
    3,
    function ($i) {
        echo "\n";
    }
);

foreach ($repeater as $value) {
    echo $value;
}

/**
 * Will output:
 *     foobar
 *     foobar
 *     foobar
 */

$counter = new Hoa\Iterator\Counter(0, 12, 3);

foreach ($counter as $value) {
    echo $value, ' ';
}

/**
 * Will output:
 *     0 3 6 9
 */

$counter1 = new Hoa\Iterator\Counter(0, 12, 3);
$counter2 = new Hoa\Iterator\Counter(13, 23, 2);
$append   = new Hoa\Iterator\Append();
$append->append($counter1);
$append->append($counter2);

foreach ($append as $value) {
    echo $value, ' ';
}

/**
 * Will output:
 *     0 3 6 9 13 15 17 19 21 
 */

$foobar   = new Hoa\Iterator\Map(['f', 'o', 'o', 'b', 'a', 'r']);
$baz      = new Hoa\Iterator\Map(['b', 'a', 'z']);
$multiple = new Hoa\Iterator\Multiple(
    Hoa\Iterator\Multiple::MIT_NEED_ANY
  | Hoa\Iterator\Multiple::MIT_KEYS_ASSOC
);
$multiple->attachIterator($foobar, 'one', '!');
$multiple->attachIterator($baz,    'two', '?');

foreach ($multiple as $iterators) {
    echo $iterators['one'], ' | ', $iterators['two'], "\n";
}

/**
 * Will output:
 *     f | b
 *     o | a
 *     o | z
 *     b | ?
 *     a | ?
 *     r | ?
 */

$counter  = new Hoa\Iterator\Counter(0, 10, 1);
$multiple = new Hoa\Iterator\Multiple();
$multiple->attachIterator($counter);
$multiple->attachIterator(clone $counter);
$demultiplexer = new Hoa\Iterator\Demultiplexer(
    $multiple,
    function ($current) {
        return $current[0] * $current[1];
    }
);

foreach ($demultiplexer as $value) {
    echo $value, ' ';
}

/**
 * Will output:
 *     0 1 4 9 16 25 36 49 64 81 
 */

$directory = new Hoa\Iterator\Directory(resolve('hoa://Library/Iterator'));

foreach ($directory as $value) {
    echo $value->getFilename(), "\n";
}

/**
 * Will output:
 *     .
 *     ..
 *     .State
 *     Aggregate.php
 *     Append.php
 *     CallbackFilter.php
 *     composer.json
 *     Counter.php
 *     Demultiplexer.php
 *     …
 */

$glob = new Hoa\Iterator\Glob(resolve('hoa://Library/Iterator') . '/M*.php');

foreach ($glob as $value) {
    echo $value->getFilename(), "\n";
}

/**
 * Will output:
 *     Map.php
 *     Mock.php
 *     Multiple.php
 */

$counter   = new Hoa\Iterator\Counter(0, 5, 1);
$lookahead = new Hoa\Iterator\Lookahead($counter);

foreach ($lookahead as $value) {
    echo $value;

    if (true === $lookahead->hasNext()) {
        echo ' (next: ', $lookahead->getNext(), ')';
    }

    echo "\n";
}

/**
 * Will output:
 *     0 (next: 1)
 *     1 (next: 2)
 *     2 (next: 3)
 *     3 (next: 4)
 *     4
 */

$abcde  = new Hoa\Iterator\Map(['a', 'b', 'c', 'd', 'e']);
$buffer = new Hoa\Iterator\Buffer($abcde, 3);

$buffer->rewind();
echo $buffer->current(); // a

$buffer->next();
echo $buffer->current(); // b

$buffer->next();
echo $buffer->current(); // c

$buffer->previous();
echo $buffer->current(); // b

$buffer->previous();
echo $buffer->current(); // a

$buffer->next();
echo $buffer->current(); // b

/**
 * Will output:
 *     abcbab
 */

$generator = new Hoa\Iterator\CallbackGenerator(function ($key) {
    return mt_rand($key, $key * 2);
});
$limit = new Hoa\Iterator\Limit($generator, 0, 10);

foreach ($limit as $value) {
    echo $value, ' ';
}

/**
 * Could output:
 *     0 2 3 4 4 7 8 10 12 18 
 */