In Lua, a constant list is a table that is used to hold a set number of items that cannot be changed once they are defined. These lists are useful in situations where you want to define a set of values that are read-only and cannot be modified during program execution.
Here's an example of how to define a constant list in Lua:
-- define a constant list of weekdays
weekdays = {"Monday", "Tuesday", "Wednesday", "Thursday", "Friday"}
-- accessing the elements of the constant list
print(weekdays[1]) -- Output: Monday
print(weekdays[3]) -- Output: Wednesday
In the above example, we've defined a constant list of weekdays using a table. We assigned the table to a variable named weekdays. Since weekdays is a constant list, we cannot change its contents once defined.
We can access the individual elements of the constant list using the index operator []. For example, weekdays[1] returns the first element of the constant list, which is "Monday".
Here's another example that shows how to iterate over a constant list in Lua:
-- define a constant list of numbers
numbers = {10, 20, 30, 40, 50}
-- print out all the elements of the constant list
for i, num in ipairs(numbers) do
print(i, num)
end
In this example, we've defined a constant list of numbers using a table. We then looped over each element of the list using the ipairs function, which returns the index and value of each element. We printed the index and value to the console using the print function.