wat is an example of how to use the Erlang native implemented
functions.

Since nif's already decrease the reliability of the erlang VM, why
not push the boundaries a bit further and create a mutable data
store?


USAGE

Erlang R13B03 (erts-5.7.4) [source] [smp:2:2] [rq:2] [async-threads:0] [kernel-poll:false]

Eshell V5.7.4  (abort with ^G)
1> wat:init(1024).
ok
2> wat:get(20).
0
3> wat:set(20,5).
5
4> wat:get(20).  
5
5> wat:add(20,10).
15
6> wat:get(20).   
15
7> wat:init(10).
ok
8> wat:get(20). 
{error,out_of_bounds}
9>