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[Arrays] Function that returns elements from given level

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Meritoo
2022-02-05 19:50:36 +01:00
parent 151ce39226
commit 067be1ab1d
3 changed files with 151 additions and 0 deletions
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4
CHANGELOG.md
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@@ -2,6 +2,10 @@
Common and useful classes, methods, exceptions etc.
# 1.1.6
1. [Arrays] Function that returns elements from given level
# 1.1.5
1. [BaseCollection] Prepare elements while adding them by `addMultiple()` method in the same way as passing them in

37
src/Utilities/Arrays.php
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@@ -1642,6 +1642,43 @@ class Arrays
return '' === trim(implode('', $array));
}
public static function getElementsFromLevel(array $array, int $level): ?array
{
if (empty($array) || $level <= 0) {
return null;
}
$result = [];
foreach ($array as $value) {
// This is the expected level (the deepest). Comparing with 1, because level will be decreased by 1, and
// finally we will get the latest/deepest level that equals 1.
if ($level === 1) {
$result[] = $value;
continue;
}
// There is no deeper level
if (!is_array($value)) {
continue;
}
// Let's dive one level down
$elements = self::getElementsFromLevel($value, $level - 1);
if ($elements === null) {
continue;
}
// I have to load each element separately to avoid issue with incorrectly nested values
foreach ($elements as $element) {
$result[] = $element;
}
}
return $result;
}
/**
* Returns neighbour (next or previous element) for given element
*

110
tests/Utilities/ArraysTest.php
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@@ -1535,6 +1535,116 @@ letsTest[2] = value_2;';
static::assertSame($expected, Arrays::containsEmptyStringsOnly($array));
}
public function testGetElementsFromLevelIfArrayIsEmpty(): void
{
self::assertNull(Arrays::getElementsFromLevel([], -1));
self::assertNull(Arrays::getElementsFromLevel([], 0));
self::assertNull(Arrays::getElementsFromLevel([], 1));
}
public function testGetElementsFromLevelIfThereIsNoGivenLevel(): void
{
self::assertSame([], Arrays::getElementsFromLevel([1, 2, 3], 9999));
}
public function testGetElementsFromLevelIfGivenLevelIsNotPositiveValue(): void
{
self::assertNull(Arrays::getElementsFromLevel([1, 2, 3], -1));
self::assertNull(Arrays::getElementsFromLevel([1, 2, 3], 0));
}
public function testGetElementsFromLevelIfArrayHasOneLevelOnly(): void
{
$array = [
// Level 1:
'ab',
'cd',
'ef',
];
self::assertSame($array, Arrays::getElementsFromLevel($array, 1));
}
public function testGetElementsFromLevel(): void
{
$array = [
// Level 1:
'ab',
[
// Level 2:
'cd',
'ef',
],
// Level 1:
[
// Level 2:
'gh',
[
// Level 3:
'ij',
'kl',
],
],
// Level 1:
[
// Level 2:
[
// Level 3:
'mn',
'op',
],
],
];
$expectedLevel1 = [
'ab',
[
'cd',
'ef',
],
[
'gh',
[
'ij',
'kl',
],
],
[
[
'mn',
'op',
],
],
];
$expectedLevel2 = [
'cd',
'ef',
'gh',
[
'ij',
'kl',
],
[
'mn',
'op',
],
];
$expectedLevel3 = [
'ij',
'kl',
'mn',
'op',
];
self::assertSame($expectedLevel1, Arrays::getElementsFromLevel($array, 1));
self::assertSame($expectedLevel2, Arrays::getElementsFromLevel($array, 2));
self::assertSame($expectedLevel3, Arrays::getElementsFromLevel($array, 3));
}
/**
* Provides simple array to set/replace values with keys
*