instructions.md

In this exercise you'll be writing code to help a sign company create custom messages for their signs.

1. Create a set of useful strings

Define the following constant strings which will be used to create signs:

• birthday: This holds the value "Birthday"
• valentine: This holds the value "Valentine's Day"
• anniversary: This holds the string "Anniversary"

2. Create a set of useful characters

Define the following constant characters which will be used to create signs:

• space: This holds the value " " (a single space)
• exclamation: This holds the value "!"

3. Combine phrases to build up messages

Implement the function buildSign(for: String, name: String) -> String. This function takes one of the three strings you defined in the first task as the for parameter and a String holding someone's name as the name parameter and uses concatenation as well as the characters defined in task #2 to build up a phrase for a sign.

buildSign(for: birthday, name: "Otto")
// => "Happy Birthday Otto!"

buildSign(for: anniversary, name: "Valentina")
// => "Happy Anniversary Valentina!"

4. Build a graduation sign

Implement the function graduationFor(name: String, year: Int) -> String which takes a name as a string parameter and a year as a string parameter and uses string interpolation to create a phrase for a sign that uses a newline to separate the two lines of the message.

graduationFor(name: "Padma", year: 2020)
// => "Congratulations Padma!\nClass of 2020"

5. Compute the cost of a sign

Implement the function costOf(sign: String) -> Int which takes a string that holds the contents of the sign and returns the cost to create the sign, which is 2 dollars for each character in the sign plus a base price of 20 dollars.

costOf(sign: "Happy Birthday Grandma!")
// => 66