exercism/elixir/remote-control-car/HINTS.md

Hints

General

• Read about structs in the Getting Started guide.
• Read about defstruct in the documentation.
• Watch Elixir Casts - #106: Intro to Structs.

1. Create a brand-new remote controlled car

• The module attribute @enforce_keys can be used to specify required values. It needs to be defined before calling defstruct.
• The nickname field should not have a default value specified.
• The new/0 function should initialize the nickname with the value "none".

2. Create a brand-new remote controlled car with a nickname

• Use multiple-function-clauses to reuse the function name but accept different arguments.
• Consider a default-argument for the function.

3. Display the distance

• For functions which accept only a specific type of struct, make sure you perform a pattern match to check the argument.
• Use the static access operator to obtain field values.

4. Display the battery percentage

• For functions which accept only a specific type of struct, make sure you perform a pattern match to check the argument.
• Use the static access operator to obtain field values.

5. Driving changes the battery and distance driven

• For functions which accept only a specific type of struct, make sure you perform a pattern match to check the argument.
• Use the static access operator to obtain field values.
• Review the introduction for updating structs.

6. Account for driving with a dead battery

• If the battery is dead, it should return the struct unchanged.