15 Jul 2013, 03:42 Dave Thomas (338 posts) Go into iex. Create and run the functions that do the following `list_concat.([1,2,3], [4,5,6]) #=> [1,2,3,4,5,6]` `sum.(1, 2, 3) #=> 6` `pair_tuple_to_list.( { 8, 7 } ) #=> [ 8, 7 ]` A Possible Solution ```iex(1)> list_concat = fn a, b -> a ++ b end #Function iex(2)> list_concat.([1,2,3], [4,5,6]) [1, 2, 3, 4, 5, 6] iex(3)> sum = fn a, b, c -> a + b + c end #Function iex(4)> sum.(1,2,3) 6 iex(5)> pair_tuple_to_list = fn {a, b} -> [ a, b ] end #Function iex(6)> pair_tuple_to_list.({ 8, 7 }) [8, 7] ``` 29 May 2014, 18:30 Paul Barry (3 posts) Strange things happening to me for that last one. On my machine, here’s what I see: ``````Erlang/OTP 17 [erts-6.0] [source] [64-bit] [smp:2:2] [async-threads:10] [hipe] [kernel-poll:false] [dtrace] Interactive Elixir (0.13.3) - press Ctrl+C to exit (type h() ENTER for help) iex(1)> pair_tuple_to_list = fn {a, b} -> [ a, b ] end #Function<6.106461118/1 in :erl_eval.expr/5> iex(2)> pair_tuple_to_list.({ 8, 7 }) '\b\a' iex(5)> pair_tuple_to_list.({ 4, 5 }) [4, 5] `````` I’m not sure why this (with {8, 7} as input to the function) is happening. As you can see, it works for {4, 5}. In fact, any time I use 7 through 13 as the first number, it does not return a list. Weird. 30 May 2014, 13:31 Fred George (1 post) I had the same strange result as Paul Barry. `'\b\a'` was returned for `{8, 7}`. Works for `{8, 3}` and `{3, 7}`. Fails for `{8, 8}`, `{7, 7}`, and `{7, 8}` with predictable letters returned. 03 Jun 2014, 14:34 José Valim (28 posts) Hello Paul and Fred! It is not a bug. Elixir actually shows a list of integers as a char list if the list of integers contains printable characters up to 128. For example, if I write: ``````iex> [106, 111, 115, 101] 'jose' `````` See how the list ended up being printed as list of characters? The reason we have this behaviour is because char lists are still used a lot in Erlang and error messages may be returned as char lists and you may stable against those from time to time and it is better to see them as a char list than a bunch of integers. If you want, however, you can disable this behaviour (on the very latest Elixir) with the following: ``````iex> IEx.configure [inspect: [char_lists: false]] `````` I hope you are having fun! 11 Jun 2014, 04:11 Miguel Diaz (1 post) Thanks for the reply José( and explanation ) I was scratching my head wondering what was going on . You must be logged in to comment