Example
Create a set
local set = {} -- empty set
Create a set with elements by setting their value to true:
local set = {pear=true, plum=true}
-- or initialize by adding the value of a variable:
local fruit = 'orange'
local other_set = {[fruit] = true} -- adds 'orange'
Add a member to the set
add a member by setting its value to true
set.peach = true
set.apple = true
-- alternatively
set['banana'] = true
set['strawberry'] = true
Remove a member from the set
set.apple = nil
Using nil instead of false to remove 'apple' from the table is preferable because it will make iterating elements simpler. nil deletes the entry from the table while setting to false changes its value.
Membership Test
if set.strawberry then
print "We've got strawberries"
end
Iterate over elements in a set
for element in pairs(set) do
print(element)
end
