RE: [Q] newbie questions about timestamp, character code, ..

["Jerome Vuarand" <jerome.vuarand@...>]

Makoto Kuwata wrote:
> * How to check whether table has key or not?

if table[key]==nil then
   print "Your table has no entry with that key"
end

You can't put nils in a table, neither as key or as values:
- table[key]=nil removes an entry from the table.
- table[nil]=value throws an error

Gergo Szakal wrote:
> if table[key] then ... end
> 
> means that if the given key in the table is non-nil, then...

Note that false is a valid table value, and in that case the test above
will fail. To be sure a key is not used check explicitly against nil.