PHP code example of talesoft / tale-iterator

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

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

    

talesoft / tale-iterator example snippets

use Tale\Iterator\MapIterator;

$values = new \ArrayIterator(range(0, 5));
$mapper = new class($values) extends MapIterator
{
    public function map()
    {
        return sprintf('Value %d', parent::map());
    }
};

var_dump(iterator_to_array($mapper));
/*
array(6) {
  [0] => string(7) "Value 0"
  [1] => string(7) "Value 1"
  [2] => string(7) "Value 2"
  [3] => string(7) "Value 3"
  [4] => string(7) "Value 4"
  [5] => string(7) "Value 5"
}
*/

use Tale\Iterator\CallbackMapIterator;

$values = new \ArrayIterator(range(0, 5));
$mapper = new CallbackMapIterator($values, function (int $number) {
    return sprintf('Value %d', $number);
});

var_dump(iterator_to_array($mapper));
/*
array(6) {
  [0] => string(7) "Value 0"
  [1] => string(7) "Value 1"
  [2] => string(7) "Value 2"
  [3] => string(7) "Value 3"
  [4] => string(7) "Value 4"
  [5] => string(7) "Value 5"
}
*/

use Tale\Iterator\FilterIterator;

$values = new \ArrayIterator(range(0, 5));
$filterer = new class($values) extends FilterIterator
{
    public function accept(): bool
    {
        return parent::current() !== 4;
    }
};

var_dump(iterator_to_array($filterer));
/*
array(5) {
  [0] => string(7) "Value 0"
  [1] => string(7) "Value 1"
  [2] => string(7) "Value 2"
  [3] => string(7) "Value 3"
  [5] => string(7) "Value 5"
}
*/

use Tale\Iterator\CallbackFilterIterator;

$values = new \ArrayIterator(range(0, 5));
$filterer = new CallbackFilterIterator($values, function (int $number) {
    return $number !== 3;
});

var_dump(iterator_to_array($filterer));
/*
array(5) {
  [0] => string(7) "Value 0"
  [1] => string(7) "Value 1"
  [2] => string(7) "Value 2"
  [4] => string(7) "Value 4"
  [5] => string(7) "Value 5"
}
*/

use Tale\Iterator\IterableIterator;

$values = new IterableIterator(['a', 'b', 'c', 'd', 'e']);
$filterer = new \RegexIterator($values, '/[a-c]/');

var_dump(iterator_to_array($filterer));
/*
array(3) {
  [0] => string(1) "a"
  [1] => string(1) "b"
  [2] => string(1) "c"
}
*/

use Tale\Iterator\CallbackFilterIterator;
use Tale\Iterator\ValueIterator;

$values = new \ArrayIterator(range(0, 5));
$filterer = new CallbackFilterIterator($values, function (int $number) {
    return $number !== 3;
});
$resetter = new ValueIterator($filterer);

var_dump(iterator_to_array($resetter));
/*
array(5) {
  [0] => string(7) "Value 0"
  [1] => string(7) "Value 1"
  [2] => string(7) "Value 2"
  [3] => string(7) "Value 4"
  [4] => string(7) "Value 5"
}

Compare the output to the CallbackFilterIterator example above
and notice the keys!
*/

use Tale\Iterator\KeyIterator;

$values = new \ArrayIterator(['a' => 1, 'b' => 2, 'c' => 3]);
$keys = new KeyIterator($values);

var_dump(iterator_to_array($keys));
/*
array(3) {
  [0] => string(1) "a"
  [1] => string(1) "b"
  [2] => string(1) "c"
}

Compare the output to the CallbackFilterIterator example above
and notice the keys!
*/

use Tale\Iterator\FlipIterator;

$values = new \ArrayIterator(range('a', 'e'));
$flipper = new FlipIterator($values);

var_dump(iterator_to_array($flipper));
/*
array(5) {
  'a' => int(0)
  'b' => int(1)
  'c' => int(2)
  'd' => int(3)
  'e' => int(4)
}
*/

use Tale\Iterator\FlipIterator;

$values = new \ArrayIterator(['a' => 1, 'b' => 2, 'c' => 2, 'd' => 2]);
$flipper = new FlipIterator($values);

//Do something with $flipper, like, iterator stuff

$reverseFlipper = new FlipIterator($flipper);

var_dump(iterator_to_array($reverseFlipper));
/*
array(4) {
  'a' => int(1)
  'b' => int(2)
  'c' => int(2)
  'd' => int(2)
}
*/

use Tale\Iterator\FormatIterator;

$values = new \ArrayIterator(range(0, 5));
$formatter = new FormatIterator($values, 'Value %d');

var_dump(iterator_to_array($formatter));
/*
array(6) {
  [0] => string(7) "Value 0"
  [1] => string(7) "Value 1"
  [2] => string(7) "Value 2"
  [3] => string(7) "Value 3"
  [4] => string(7) "Value 4"
  [5] => string(7) "Value 5"
}
*/

use Tale\Iterator\PrefixIterator;

$values = new \ArrayIterator(range(0, 5));
$prefixer = new PrefixIterator($values, 'Value ');

var_dump(iterator_to_array($prefixer));
/*
array(6) {
  [0] => string(7) "Value 0"
  [1] => string(7) "Value 1"
  [2] => string(7) "Value 2"
  [3] => string(7) "Value 3"
  [4] => string(7) "Value 4"
  [5] => string(7) "Value 5"
}
*/

use Tale\Iterator\SuffixIterator;

$values = new \ArrayIterator(range(0, 5));
$suffixer = new SuffixIterator($values, ' Value');

var_dump(iterator_to_array($suffixer));
/*
array(11) {
  [0] => string(7) "0 Value"
  [1] => string(7) "1 Value"
  [2] => string(7) "2 Value"
  [3] => string(7) "3 Value"
  [4] => string(7) "4 Value"
  [5] => string(7) "5 Value"
}
*/

use Tale\Iterator\IndexIterator;

$values = new \ArrayIterator(['a' => 'b', 'b' => 'c', 'c' => 'd']);
$indexer = new IndexIterator($values);

foreach ($indexer as $key => $value) {
    $i = $indexer->getIndex();
    echo "{$key} => {$value} - at index: {$i}\n";
}
/*
a => b - at index: 0
b => c - at index: 1
c => d - at index: 2
*/

use Tale\Iterator\FlipIterator;
use Tale\Iterator\CallbackMapIterator;

$values = new \ArrayIterator(['a' => 1, 'b' => 2, 'c' => 3, 'd' => 4]);
$mapper = new FlipIterator(
    new CallbackMapIterator(
        new FlipIterator($values),
        function (string $key) {
            return "Key {$key}";
        }
    )
);

var_dump(iterator_to_array($mapper));
/*
array(4) {
  'Key a' => int(1)
  'Key b' => int(2)
  'Key c' => int(3)
  'Key d' => int(4)
}
*/

use Tale\Iterator\FlipIterator;
use Tale\Iterator\CallbackFilterIterator;

$values = new \ArrayIterator(['a' => 1, 'b' => 2, 'c' => 3, 'd' => 4]);
$mapper = new FlipIterator(
    new CallbackFilterIterator(
        new FlipIterator($values),
        function (string $key) {
            return $key !== 'b';
        }
    )
);

var_dump(iterator_to_array($mapper));
/*
array(4) {
  'a' => int(1)
  'c' => int(3)
  'd' => int(4)
}
*/