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For each body should be wrapped in an if statement (#14)
unit test to go with commit
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@ -16,7 +16,9 @@ class Product
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{
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$product = 0;
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foreach ($a as $index => $value) {
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$product += $value * $b[$index];
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if (is_numeric($value) && is_numeric($b[$index])) {
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$product += $value * $b[$index];
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}
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}
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return $product;
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