2.1.6. Assignment

[mserykh]

Assignment

Data Types Practice

Instructions

Imagine you are building a shopping cart. Write some documentation on the data types that you would need to complete your shopping experience. How did you arrive at your choices?

Rubric

Criteria	Exemplary	Adequate	Needs Improvement
	The six data types are listed and explored in detail, documenting their use	Four datatypes are explored	Two data types are explored

[mserykh]

Shopping cart

Data types

Short description

• Number: is used for prices, quantities, subtotal, amount of discounts, e.g.

const price = 457.00;

• String: is used for title of the product, brand name, currency, user email, image, characteristics such as color, user id, product id, e.g.

const productName = "Socks";
const currencyShort = "$";
const currencyName = "dollar";

• Boolean: is used for availability of the product (available / unavailable to purchase), if it is on sale, e.g.

const isAvailable = true;

• undefined: is used by JS when something went wrong and an error must be thrown

• Array: is used to store shopping lists, previous orders, e.g.

const shoppingList = [
{
     productName: productName1,
     price: price1,
     currencyShort: currencyShort1,
     quantity: quantity
},
{
     productName: productName2,
     price: price2,
     currencyShort: currencyShort2,
     quantity: quantity
}
];

• Date: is used to store a date of purchase.

[dev-experience]

• [x] Please fix data type names (check the docs).
• [x] I wouldn't use BigInt for IDs.
• [x] I don't see why you can't use other data types rather than primitive ones.

[mserykh]

@dev-experience I decided not to use BigInt and moved product ID to the Number. Also I added another type: Object.

[dev-experience]

• [x] I wouldn't use Number for IDs. IDs are just static values. Even if it looks like number, it should be an integer number. But conceptually, it's just an identifier, not number. I would use string for that.
• [x] Type names are a bit incorrect in your answer.
  • Check out: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String
  • https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number
  • etc.

• [x] Best practice for naming object properties is camel case (not strings).

  • It's essentially the same but strings with spaces and special characters can be used only with such syntax (which is not handy):

  console.log(shoppingList['product name']);

  • It should be done in such way instead:

    console.log(shoppingList.productName);

  • So, usually it's quite boring:

    {
     productName: productName,
     price: price,
     currencyShort: currencyShort,
     quantity: quantity,
    }

• [x] You mentioned only 5 data types. Please revisit the shoppingList. It's a good candidate to use one more data type. List means that there will be zero or more amount of items, not just one.

[mserykh]

@dev-experience what do you mean by boring? Can you please explain? And can you please give me a link or hint where I can read more about how to use data types in projects and documentation, how to design applications? And is this really a good task for newbies to programming world?

So, usually it's quite boring:

{ productName: productName, price: price, currencyShort: currencyShort, quantity: quantity, }

[dev-experience]

@mserykh we'll cover everything later. I consider task as done. Feel free to update the answer again.

[mserykh]

@mserykh we'll cover everything later. I consider task as done. Feel free to update the answer again.

@dev-experience I have updated the answer:

• I updated the data types names
• I moved user ID to String type;
• I added a new data type Date;
• I changed Object to Array for shopping lists in order to store more than 1 product;
• I update object property names.