Cyclomatic Complexity

Transcript

1. foolab.ca | @foolabca Cyclomatic Complexity Bulgaria PHP, Sofia - October

   8, 2016

2. Execution Paths public function getShipping() { if ($this->subtotal >= 40)

   { return 0; } return $this->standardShipping; } 2

3. Execution Paths public function getShipping() { if ($this->subtotal >= 40)

   { return 0; } return $this->standardShipping; } 3 Path 1 Path 2

4. Decision Branches 4 start product loop free shipping? end

5. Decision Branches 5 start product loop free shipping? end

6. Cyclomatic complexity = edges − nodes +
 2 * connected

   components

7. Decision Branches 7 start product loop free shipping? end ◦

   Edges ◦ Nodes ◦ Connected components.

8. Decision Branches 8 start product loop free shipping? end ◦

   Edges ◦ Nodes ◦ Connected components.

9. Decision Branches 9 start product loop free shipping? end ◦

   Edges ◦ Nodes ◦ Connected components.

10. Cyclomatic complexity = 9 − 8 + 2 * 1

    = 3

11. Zero Times foreach ($products as $product) { $total = $product->price

    * $product->quantity; } $tax = $total * ... 11

12. Multiple Times $total = 0; foreach ($products as $product) {

    $total = $product->price * $product->quantity; } $tax = $total * ... 12

13. Multiple Times $total = 0; foreach ($products as $product) {

    $total += $product->price * $product->quantity; } $tax = $total * ... 13

14. @afilina afilina.com