groupBy() - Code Metrics - Inspection of "Compile bundle" - baethon/phln - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( 892a45...bd3bd3 )

by Radosław

created 2018-09-04 19:43 UTC

groupBy() A

↳ Parent: Project

Complexity

Conditions	1
Paths	1

Size

Total Lines	3
Code Lines	1

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	1
eloc	1
nc	1
nop	2
dl	0
loc	3
rs	10
c	0
b	0
f	0

<?php
declare(strict_types=1);

namespace phln\collection;

use function phln\fn\curryN;

const groupBy = '\\phln\\collection\\groupBy';
const 𝑓groupBy = '\\phln\\collection\\𝑓groupBy';

/**
 * Splits a list into sub-lists stored in an object, based on the result of calling a String-returning function on each element, and grouping the results according to values returned.
 *
 * @phlnSignature (a -> String) -> [a] -> { String: [a] }
 * @phlnCategory collection
 * @param callable $fn
 * @param array $collection
 * @return \Closure|array
 * @example
 *      \phln\collection\groupBy(
 *          function (int $i) {
 *              return ($i % 2 === 0)
 *                  ? 'even'
 *                  : 'odd';
 *          },
 *          [1, 2, 3, 4]
 *      ); // ['odd' => [1, 3], 'even' => [2, 4]]
 */
function groupBy(callable $fn = null, array $collection = null)
{
    return curryN(2, 𝑓groupBy, func_get_args());
}

function 𝑓groupBy(callable $fn, array $collection): array
{
    return reduce(

        function ($carry, $item) use ($fn) {
            $key = $fn($item);
            $innerList = array_key_exists($key, $carry)
                ? $carry[$key]
                : [];

            $carry[$key] = array_merge($innerList, [$item]);

            return $carry;
        },
        [],
        $collection
    );
}


1			<?php
2			declare(strict_types=1);
3
4			namespace phln\collection;
5
6			use function phln\fn\curryN;
7
8			const groupBy = '\\phln\\collection\\groupBy';
9			const 𝑓groupBy = '\\phln\\collection\\𝑓groupBy';
10
11			/**
12			* Splits a list into sub-lists stored in an object, based on the result of calling a String-returning function on each element, and grouping the results according to values returned.
13			*
14			* @phlnSignature (a -> String) -> [a] -> { String: [a] }
15			* @phlnCategory collection
16			* @param callable $fn
17			* @param array $collection
18			* @return \Closure\|array
19			* @example
20			* \phln\collection\groupBy(
21			* function (int $i) {
22			* return ($i % 2 === 0)
23			* ? 'even'
24			* : 'odd';
25			* },
26			* [1, 2, 3, 4]
27			* ); // ['odd' => [1, 3], 'even' => [2, 4]]
28			*/
29			function groupBy(callable $fn = null, array $collection = null)
30			{
31			return curryN(2, 𝑓groupBy, func_get_args());
32			}
33
34			function 𝑓groupBy(callable $fn, array $collection): array
35			{
36			return reduce(
			0 ignored issues – show Bug Best Practice introduced 2018-09-04 19:47 UTC by Report Bug Copy Issue Report The expression `return reduce(function(...., array(), $collection)` could return the type `Closure` which is incompatible with the type-hinted return `array`. Consider adding an additional type-check to rule them out. Loading history...
37			function ($carry, $item) use ($fn) {
38			$key = $fn($item);
39			$innerList = array_key_exists($key, $carry)
40			? $carry[$key]
41			: [];
42
43			$carry[$key] = array_merge($innerList, [$item]);
44
45			return $carry;
46			},
47			[],
48			$collection
49			);
50			}
51

baethon / phln

Push — master ( 892a45...bd3bd3 )

groupBy() A

Complexity

Size

Duplication

Importance

Duplication Side-by-Side

Filter issues like