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module "set"
function new(list)
local items = {};
local set = { items = items };
function set:add(set, item)
items[item] = true;
end
function set:contains(set, item)
return items[item]
end
function set:items(set)
return items;
end
function set:remove(set, item)
items[item] = nil;
end
function set:add_list(set, list)
for _, item in ipairs(list) do
items[item] = true;
end
end
function set:include(set, otherset)
for item in pairs(otherset) do
items[item] = true;
end
end
function set:exclude(set, otherset)
for item in pairs(otherset) do
items[item] = nil;
end
end
return set;
end
function union(set1, set2)
local set = new();
local items = set.items;
for item in pairs(set1.items) do
items[item] = true;
end
for item in pairs(set2.items) do
items[item] = true;
end
return set;
end
function difference(set1, set2)
local set = new();
local items = set.items;
for item in pairs(set1.items) do
items[item] = true;
end
for item in pairs(set2.items) do
items[item] = nil;
end
return set;
end
return _M;
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