[erlang-questions] output [[[|2]|1]|0] instead of [2.1.0]
Tue Feb 10 15:45:39 CET 2015
On 02/10/2015 03:42 PM, Loïc Hoguin wrote:
> You are creating what is called an improper list.
> This is a proper list:
> This is the same list using the | operator:
> Now what happens if you write this, for example?
> It still works. This is called an improper list. An improper list is a
> list where the tail is not a list.
Forgot to say that most lists functions expect proper lists and will
fail when they encounter an improper list, including the length/1 function.
> When you do A++B Erlang will only ensure that A is a list. B can be
> anything. If it's not a list, however, then you end up with an improper
> I advise you to avoid ++ when doing most list related exercices, go with
> the | operator instead.
> On 02/10/2015 03:19 PM, Roelof Wobben wrote:
>> I have to make a reversed list to a number so reverse_list(2) will
>> output [2.1]
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