luaHow to create function

function say_hi(to)
   return 'Hi ' .. to.. '!';
endctrl + cyoutubegithub

`function say_hi` declare new function named `say_hi`	`(to)` argument(s)
`return 'Hi ' .. to.. '!';` implementation (returns greeting string in our case)	`end` ends function block

function say_hi(to)
   return 'Hi ' .. to .. '!';
end

print( say_hi('all') )

Hi all!