filter_numbers

Filter Numbers

Reading material

• Learn You Some Erlang: Starting Out (for real)
• How to make a list of numbers: lists:seq/2

Exercises

Filter in

Create a function filter_numbers:filter_in/3 that takes three integers (From, To, and N) and returns a list of all the numbers between From and To that are multiples of N. You must use list comprehension.

1> filter_numbers:filter_in(1,100, 7).
[7,14,21,28,35,42,49,56,63,70,77,84,91,98]

Filter out

Create a function filter_numbers:filter_out/3 that takes three integers (From, To, and N) and returns a list of all the numbers between From and To that are not multiples of N. You must use list comprehension.

1> filter_numbers:filter_out(1,10, 7).
[1,2,3,4,5,6,8,9,10]

Filter in values

Create a function filter_numbers:filter_in_values/3 that takes two integers and a tuple of two integers(From, To, and {Min, Max}) and returns a list of all the numbers between From and To that are between the values of Min and Max. You must use list comprehension.

1> filter_numbers:filter_in_values(1,100,{25,38}).
[25,26,27,28,29,30,31,32,33,34,35,36,37,38]

Testing your solution

To test your solution go to the root of the erlings folder and do make sequential/filter_numbers. This will run the tests for this specific exercise.

Our solution

You can check our proposed solution.