can i have multiple databases for single website code example

Example 1: How can you print in lua/roblox

-- You can print string
print("Hello, World!")
-- You can print math
print(5 + 5)
-- You can print variables
local i = 5
print(i + 2)
-- You can print number
print(5)

Example 2: can you do a join() in js without the commas

arr.join("")