# Hints

## General

- [Go by example map][gobyexample-map]
- [Go maps in action][goblog-map]

## 1. Store the unit of measurement in your program

- To store the measurement in your program, you can use map literal, see [go blog about map][goblog-map]

## 2. Create a new bill

- To create a new bill, you all you need to do is reinitialize the customer, see [go blog about map][goblog-map]

## 3. Add item to the customer bill

- To check whether the given unit of measurement is correct, you can test your measurement map for a key without retrieving a value, see [go blog about map][goblog-map]

## 4. Remove item from the customer bill

- To check whether the given item is in customer bill, you can test your measurement map for a key without retrieving a value, see [go blog about map][goblog-map]

- To check whether the given unit of measurement is correct, you can test your measurement map for a key without retrieving a value, see [go blog about map][goblog-map]

## 5. Return the number of specific item that is in the customer bill

- To check whether the given item is in customer bill, you can test your measurement map for a key without retrieving a value, see [go blog about map][goblog-map]

[gobyexample-map]: https://gobyexample.com/maps
[goblog-map]: https://blog.golang.org/maps