exercism/elixir/lucas-numbers/HINTS.md

Hints

General

• Use the built-in (linked) list type.
• Use the built-in Stream module functions to create a stream

1. Generate the base cases

• You can use multiple function clauses and pattern-matching to create the base case functions.

2. Create the generalized case

• Use the Stream.iterate/2 function to generate a sequence of numbers, with the next being created from the previous.
• The starting numbers are 2 then 1, which you can pass in together using a tuple to make a pair {2, 1}
• Make sure the next number is the sum of the two numbers previous to it.
• To evaluate the stream to a list, use an Enum function.

3. Catch bad arguments

• Use a guard to catch the cases when an integer isn't passed as an argument to generate/1.