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<?php |
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/** |
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* @author Maxim Sokolovsky |
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*/ |
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namespace WS\Utils\Collections\Functions; |
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use Closure; |
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use WS\Utils\Collections\Collection; |
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use WS\Utils\Collections\HashMap; |
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use WS\Utils\Collections\Map; |
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/** |
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* Class Aggregators |
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* This class consist of static methods with < Fn(...$args: mixed): <Fn($c: Collection): mixed> > |
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* @package WS\Utils\Collections\Functions |
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*/ |
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class Collectors |
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{ |
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/** |
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* Returns function with interface <Fn($c: Collection): string> for concatenating collection strings |
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* @param string $delimiter |
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* @return Closure |
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*/ |
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public static function concat(string $delimiter = ''): Closure |
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{ |
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return static function (Collection $collection) use ($delimiter) { |
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return implode($delimiter, $collection->toArray()); |
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}; |
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} |
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/** |
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* Returns closure <Fn($c: Collection): float> for getting average collection value |
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* @return Closure |
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*/ |
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public static function average(): Closure |
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{ |
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/** |
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* @param Collection $collection |
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* @return float|int |
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*/ |
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return static function (Collection $collection) { |
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$array = $collection->toArray(); |
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return array_sum($array) / count($array); |
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}; |
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} |
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/** |
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* Returns closure for getting <Fn($c: Collection): Map<value: mixed, repeats: int>>. keys - collection uniq values, values - count of repeats |
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* @return Closure |
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*/ |
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public static function group(): Closure |
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{ |
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return static function (Collection $collection): Map { |
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$groupBy = self::groupBy(static function ($el) { |
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return $el; |
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}); |
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return $groupBy($collection); |
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}; |
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} |
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/** |
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* Returns closure for getting map <Fn($c: Collection): Map<value: mixed, repeats: int>>. keys - value uniq fieldName values, values - count of repeats |
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* @param string $property |
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* @return Closure |
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*/ |
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public static function groupByProperty(string $property): Closure |
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{ |
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return static function (Collection $collection) use ($property): Map { |
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$fGetValue = static function ($obj) use ($property) { |
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return ObjectFunctions::getPropertyValue($obj, $property); |
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}; |
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$groupBy = self::groupBy($fGetValue); |
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return $groupBy($collection); |
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}; |
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} |
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/** |
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* Returns closure for getting map <Fn($c: Collection): Map<value: mixed, repeats: int>>. keys - value uniq fieldName values, values - count of repeats |
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* @param callable $f |
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* @return Closure |
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*/ |
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public static function groupBy(callable $f): Closure |
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{ |
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return static function (Collection $collection) use ($f): Map { |
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$group = new HashMap(); |
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$collection |
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->stream() |
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->each(static function ($el) use ($group, $f) { |
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$value = $f($el); |
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$count = 0; |
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if (($gCount = $group->get($value)) !== null) { |
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$count = $gCount; |
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} |
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$group->put($value, $count + 1); |
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}); |
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return $group; |
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}; |
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} |
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} |
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worksolutions /
php-collections
