Re: [FUN] Codegolf: convert float to integer

[Jonathan Goble <jcgoble3@...>]

On Tue, May 21, 2019 at 3:30 PM Egor Skriptunoff
<egor.skriptunoff@gmail.com> wrote:
>
> This post is just for fun.
>
> Global variable "x" contains some integer number in float format.
> Your task is to convert it to integer datatype.
>
> The code must be compatible with Lua 5.1, 5.2 and 5.3:
> 1) on Lua 5.1/5.2 variable x doesn't change its value;
> 2) on Lua 5.3 variable x converts its float value to corresponding integer value.
>
>
> This is not a solution (due to syntax error is raised on Lua 5.1):
> x=x|0
>
> Obvious solution takes 15 bytes:
> x=math.floor(x)
>
> Less obvious solution takes 14 bytes:
> x=math.ceil(x)
>
> There exist non-obvious solution in 13 bytes.
> Find it.

Took me a few minutes, but I found it:

x=next{[x]=0}