Backward Compatibility in JavaScript: Practice

function processData(items) {
    const processedItems = items.map(item => {
        const processedItem = {};
        for (const key in item) {
            processedItem[key] = typeof item[key] === 'string' ? item[key].toUpperCase() : item[key];
        }
        return processedItem;
    });
    
    processedItems.slice(0, 3).forEach(item => console.log(`Processed Item: ${JSON.stringify(item)}`));
}

// Default behavior - convert string values to uppercase
processData([{ name: "apple", quantity: 10 }, { name: "orange", quantity: 5 }]);

function processData(items, condition = () => true, transform = null) {
    const processedItems = items.reduce((acc, item) => {
        if (condition(item)) {
            let processedItem;
            if (transform) {
                processedItem = transform(item);
            } else {
                processedItem = {};
                for (const key in item) {
                    processedItem[key] = typeof item[key] === 'string' ? item[key].toUpperCase() : item[key];
                }
            }
            acc.push(processedItem);
        }
        return acc;
    }, []);

    processedItems.slice(0, 3).forEach(item => console.log(`Processed Item: ${JSON.stringify(item)}`));
}

// Default behavior - convert string values to uppercase
processData([{ name: "apple", quantity: 10 }, { name: "orange", quantity: 5 }]);

// Custom filter - select items with a quantity greater than 5
processData(
    [{ name: "apple", quantity: 10 }, { name: "orange", quantity: 5 }],
    item => item.quantity > 5
);

// Custom transformation - convert names to uppercase and multiply the quantity by 2
const customTransform = item => {
    const transformedItem = {};
    for (const key in item) {
        transformedItem[key] = key === "name" ? item[key].toUpperCase() : item[key] * 2;
    }
    return transformedItem;
};
processData(
    [{ name: "apple", quantity: 10 }, { name: "orange", quantity: 5 }],
    () => true,
    customTransform
);