Reducing Complexity by Refactoring with Guard Clauses in PHP and JavaScript

complexity-traditional-if-else.php

<?php

function calculateSalePrice(Item $item, $discount = 0) : int
{
    $price = 0;
    
    if ($discount == 0) {
        $price = $item->getPrice();
    }
    else {
        $price = calculateDiscountedPrice($item->getPrice(), $discount);
    }
    
    return $price;
}