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by Edward
03:03
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StdDevAggregator::aggregateNumericData()   A

↳ Parent: StdDevAggregator

Complexity

Conditions 2
Paths 2

Size

Total Lines 17
Code Lines 10

Duplication

Lines 0
Ratio 0 %

Code Coverage

Tests 11
CRAP Score 2

Importance

Changes 0
Metric Value
cc 2
eloc 10
nc 2
nop 2
dl 0
loc 17
ccs 11
cts 11
cp 1
crap 2
rs 9.9332
c 0
b 0
f 0
1 
<?php
2 
declare(strict_types=1);
3 

            


            
                                                                                                            
                            
            
                                    
            
            

                
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namespace Remorhaz\JSON\Path\Runtime\Aggregator;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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use function array_map;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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use function array_sum;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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use function count;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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use Remorhaz\JSON\Path\Value\LiteralScalarValue;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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use Remorhaz\JSON\Data\Value\ScalarValueInterface;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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use Remorhaz\JSON\Data\Value\ValueInterface;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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use function sqrt;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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final class StdDevAggregator extends NumericAggregator

            


            
                                                                                                            
                            
            
                                    
            
            

                
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{

            


            
                                                                                                            
                                                                
            
                                    
            
            

                
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    protected function aggregateNumericData(array $dataList, ScalarValueInterface ...$elements): ?ValueInterface

            


            
                                                                        
                            
            
                                    
            
            

                
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    {

            


            
                                                                        
                            
            
                                    
            
            

                
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        $count = count($dataList);

            


            
                                                                        
                            
            
                                    
            
            

                
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        if ($count < 2) {

            


            
                                                                        
                            
            
                                    
            
            

                
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            return null;

            


            
                                                                        
                            
            
                                    
            
            

                
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        }

            


            
                                                                        
                            
            
                                    
            
            

                
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        $meanValue = array_sum($dataList) / $count;

            


            
                                                                        
                            
            
                                    
            
            

                
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        $calculateSquaredDifferenceFromMean = function ($value) use ($meanValue): float {

            


            
                                                                        
                            
            
                                    
            
            

                
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            return ($value - $meanValue) ** 2;

            


            
                                                                        
                            
            
                                    
            
            

                
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        };

            


            
                                                                        
                            
            
                                    
            
            

                
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        $squaredDifferencesSum = array_sum(array_map($calculateSquaredDifferenceFromMean, $dataList));

            


            
                                                                        
                            
            
                                    
            
            

                
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        $variance = $squaredDifferencesSum / ($count - 1);

            


            
                                                                        
                            
            
                                    
            
            

                
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        $standardDeviation = sqrt($variance);

            


            
                                                                        
                            
            
                                    
            
            

                
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        return new LiteralScalarValue($standardDeviation);

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    }

            


            
                                                                                                            
                                                                
            
                                    
            
            

                
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}

            


            
                                                        
            
                                    
            
            

                
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