// Products base data

var productsData = {

    a: {

        id: 2759167427,

        title: 'Practical Silk Bag',

        handle: 'practical-silk-bag',

        vendor: 'Legros, Willms and Von',

        product_type: 'Bag',

    },

    b: {

        id: 2759167417,

        title: 'Practical Silk Bag 2',

        handle: 'practical-silk-bag-2',

        vendor: 'Legros, Willms and Von 2',

        product_type: 'Bag 2',

    },

    c: {

        id: 2759167417,

        title: 'Practical Silk Bag 3',

        handle: 'practical-silk-bag-3',

        vendor: 'Legros, Willms and Von 3',

        product_type: 'Computer', // This product must be returned

    },

    d: {

        id: 2759167417,

        title: 'Practical Silk Bag 4',

        handle: 'practical-silk-bag-4',

        vendor: 'Legros, Willms and Von 4',

        product_type: 'Keyboard', // This product must be returned

    }

};

​

​

/**

 * Function to find products by any condition

 */

function searchItemsByCondition(products, evaluateCondition) {

​

    var ans = [];

​

    for (var item in productsData) {

        // Making sure the object has the property product_type

        if (products[item].hasOwnProperty('product_type')) {

            if (evaluateCondition(products[item])) {

                ans.push(products[item]);

            }

        }

    }

    return ans;

}

​

​

function searchByKeyboardOrComputer(product) {

    return (product.product_type === 'Computer') || (product.product_type === 'Keyboard');

}

​

​

// Call the function passing the evaluation function to satisfy.

// It should log only the items with 'Keyboard' or 'Computer' product_type

console.log(searchItemsByCondition(productsData, searchByKeyboardOrComputer));