PHP code example of smoren / sequence

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

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

    

smoren / sequence example snippets

use function Smoren\Sequence\Functions\xrange;

foreach(xrange(5) as $i) { // start: 0; count: 5; step: 1
    echo "{$i} ";
}
// 0 1 2 3 4

foreach(xrange(1, 5) as $i) { // start: 1; count: 5; step: 1
    echo "{$i} ";
}
// 1 2 3 4 5

foreach(xrange(1, 5, 2) as $i) { // start: 1; count: 5; step: 2
    echo "{$i} ";
}
// 1 3 5 7 9

use Smoren\Sequence\Structs\Range;
use Smoren\Sequence\Exceptions\OutOfRangeException;

/* Simple int range */
$range = new Range(1, 3, 2); // (from, size, step)
var_dump($range->isInfinite()); // false

foreach($range as $value) {
    echo "{$value} ";
}
// 1 3 5

var_dump($range[0]); // 1
var_dump($range[1]); // 3
var_dump($range[2]); // 5

try {
    $range[3];
} catch(OutOfRangeException $e) {
    echo "cannot get value from index out of range\n";
}

var_dump($range[-1]); // 5
var_dump($range[-2]); // 3
var_dump($range[-3]); // 1

try {
    $range[-4];
} catch(OutOfRangeException $e) {
    echo "cannot get value from index out of range\n";
}

/* Infinite int range */
$range = new Range(1, null, 2);
var_dump($range->isInfinite()); // true

foreach($range as $i => $value) {
    echo "{$value} ";
    if($i > 100) break;
}
// 1 3 5 7 9 11 13...

/* Float range */
$range = new Range(1.1, 3, 2.1);
var_dump($range->isInfinite()); // false

foreach($range as $value) {
    echo "{$value} ";
}
// 1.1 3.2 5.3

use Smoren\Sequence\Structs\Exponential;
use Smoren\Sequence\Exceptions\OutOfRangeException;

/* Simple int exponential sequence */
$sequence = new Exponential(1, 4, 2); // (from, size, step)
var_dump($sequence->isInfinite()); // false

foreach($sequence as $value) {
    echo "{$value} ";
}
// 1 2 4 8

var_dump($sequence[0]); // 1
var_dump($sequence[1]); // 2
var_dump($sequence[2]); // 4
var_dump($sequence[3]); // 8

try {
    $sequence[4];
} catch(OutOfRangeException $e) {
    echo "cannot get value from index out of range\n";
}

var_dump($sequence[-1]); // 8
var_dump($sequence[-2]); // 4
var_dump($sequence[-3]); // 2
var_dump($sequence[-4]); // 1

try {
    $sequence[-5];
} catch(OutOfRangeException $e) {
    echo "cannot get value from index out of range\n";
}

/* Infinite int exponential sequence */
$sequence = new Exponential(1, null, 2);
var_dump($sequence->isInfinite()); // true

foreach($sequence as $i => $value) {
    echo "{$value} ";
    if($i > 100) break;
}
// 1 2 4 8 16 32 64...

/* Infinite float exponential sequence */
$sequence = new Exponential(0.5, null, 2);
var_dump($sequence->isInfinite()); // true

foreach($sequence as $value) {
    echo "{$value} ";
}
// 0.5 0.25 0.125...

use Smoren\Sequence\Structs\DynamicSequence;

// (from, size, nextValueGetter, indexValueGetter)
$sequence = new DynamicSequence(1, 5, static function($previousValue) {
    return $previousValue + 1;
}, static function($index, $startValue) {
    return $startValue + $index;
});

var_dump(iterator_to_array($sequence));
// [1, 2, 3, 4, 5]

use Smoren\Sequence\Structs\IndexedArray;
use Smoren\Sequence\Exceptions\OutOfRangeException;

$array = new IndexedArray([10, 20, 30]);

$array[0] = 11;
$array[-1] = 33;
$array[1] = 22;
var_dump(count($array)); // 3
print_r($array->toArray()); // [11, 22, 33]

unset($array[1]);
print_r($array->toArray()); // [11, 33]

$array[] = 111;
print_r($array->toArray()); // [11, 33, 111]

try {
    $array[3];
} catch(OutOfRangeException $e) {
    echo "cannot get value from index out of range\n";
}

try {
    $array[3] = 1;
} catch(OutOfRangeException $e) {
    echo "cannot set value from index out of range\n";
}

try {
    unset($array[3]);
} catch(OutOfRangeException $e) {
    echo "cannot unset value from index out of range\n";
}

use function Smoren\Sequence\Functions\xrange;

$range = xrange(5);
print_r(iterator_to_array($range));
// [0, 1, 2, 3, 4]

$range = xrange(1, 5);
print_r(iterator_to_array($range));
// [1, 2, 3, 4, 5]

$range = xrange(1, 5, 2);
print_r(iterator_to_array($range));
// [1, 3, 5, 7, 9]

use function Smoren\Sequence\Functions\map;

$ids = [1, 2, 3];
$names = ['Mary', 'Jane', 'Alice'];
$result = map(static function(int $id, string $name) {
    return "{$id}. {$name}";
}, $ids, $names);
print_r($result->toArray());
// ['1. Mary', '2. Jane', '3. Alice']

use function Smoren\Sequence\Functions\filter;

$input = [1, 2, 3, 4, 5];
$result = filter($input, static function($item) {
    return $item > 2;
});
print_r($result->toArray());
// [3, 4, 5]

use function Smoren\Sequence\Functions\reduce;

$input = [1, 2, 3, 4, 5];
$result = reduce($input, static function($carry, $item) {
    return $carry + $item;
}, 0);
var_dump($result);
// 15