Functions can carry out a procedure or compute and return values. We can make a function call as a statement or we can use it as an expression. We have learned that functions can be variables. A table can use those variables to store them as properties.
Functions are the most important means of abstraction in Lua. One function that we have used many times is: print. In the following example, the print function is being told to execute one piece of data—the string, "My favorite number is 8":
print("My favorite number is 8") -- My favorite number is 8Another way of saying this is that print is being called with one argument. print is only one of the many built-in functions that Lua has, but almost any program you write will involve you defining your own functions.