var inventory = {
    '000001': {
        name: 'Banana Slicer',
        price: 2.99
    },
    '000002': {
        name: 'Three Wolves Tea Cozy',
        price: 14.95
    }
};

function tenPercentOffOf (obj) {
    obj.price = Math.round(0.9 * obj.price * 100) / 100;
    return obj;
}

// INSTRUCTIONS
//
// Please refer to the following Javascript variable declaration. When submitting your
// application, please answer the following three questions at the top of your cover
// letter, before any salutations or headings.
//
// var bargainBananaSlicer = tenPercentOffOf(inventory['000001']);
//
// Question 1: After declaring that variable, what is the value of bargainBananaSlicer.price?
// Question 2: After declaring that variable, what is the price of the Banana Slicer
//             in the inventory object?
// Question 3: Can you suggest ways to improve this code?



//ANSWERS
// Question 1: After declaring that variable, what is the value of bargainBananaSlicer.price
// Answer 1: 'bargainBananaSlicer.price` would be 2.69

// Question 2: After declaring that variable, what is the price of the Banana Slicer in the inventory object?
// Answer 2: Value of banana Slice would be 2.69 Because object passed in the function was not clone or cached into variable
//so when mutation process it affects the orignal value.

// Answer 3.
 // Object.assign create a swallow copy of the object.
/**
 * @param  {} obj Object
 * Return Ten percent of price off
 */
 const tenPercentOffOf = (obj) => {
     if (!obj.hasOwnProperty("price")) return console.warn("Property price does not exist");
     return Object.assign({}, obj, {
         price: Math.round(0.9 * obj.price * 100) / 100
     });
 }

 // Sample 2. using lodash _.clone
 // _.clone create a swallow copy of __obj
/**
 * @param  {} obj Object
 * Return Ten percent of price off
 */
 const tenPercentOffOf = (obj) => {
     let obj = _.clone(__obj);
     if (obj.hasOwnProperty("price")) {
         obj.price = Math.round(0.9 * obj.price * 100) / 100;
         return obj;
     } else {
         console.warn("Property price does not exist")
     }
 }