[erlang-patches] Add lists:init/1 - got tired of implementing it

Yurii Rashkovskii <>
Thu Apr 25 17:57:48 CEST 2013


What about non-tail-recursiveness, though?


On Thu, Apr 25, 2013 at 8:54 AM, Fred Hebert <> wrote:

> Sounds to me like it would have been better implemented as something like:
>
> init([_]) -> [];
> init([H|T]) -> [H|init(T)].
>
> As this would avoid re-building the list twice, once on each reversal.
>
> Regards,
> Fred.
>
>
> On Thu, Apr 25, 2013 at 11:12 AM, Hans Svensson <> wrote:
>
>> Hi,
>>
>> Yesterday I implemented, for the umpteenth time, the init-function. (I
>> guess being taught Haskell at one point could be blamed partly for the
>> coding style requiring this function...) It is a trivial function that I
>> think should be part of the standard lists module. This patch adds the
>> function, tests in lists_SUITE, and documentation of the function.
>>
>> The implementation is trivial: reverse(tl(reverse(List))).
>>
>> If I've missed some religious reason for not having this function feel
>> free to drop the patch ;-)
>>
>> Cheers,
>> Hans
>>
>> git fetch git://github.com/hanssv/otp.**git<http://github.com/hanssv/otp.git>add_init_to_lists
>>
>> https://github.com/hanssv/otp/**compare/erlang:maint...add_**
>> init_to_lists<https://github.com/hanssv/otp/compare/erlang:maint...add_init_to_lists>
>> https://github.com/hanssv/otp/**compare/erlang:maint...add_**
>> init_to_lists.patch<https://github.com/hanssv/otp/compare/erlang:maint...add_init_to_lists.patch>
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>
>
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