[LUA 5.1] table.concat

Given an array where all elements are strings or numbers, returns t[i]..sep..t[i+1] ··· sep..t[j].
The default value for sep is the empty string, the default for i is 1, and the default for j is the length of the table.
If i is greater than j, returns the empty string.

mytable={}
table.insert(mytable,"This")
table.insert(mytable,"is")
table.insert(mytable,"content")
print(table.concat(mytable,'-')) -- This-is-content