require "map"
local fmt = require "fmt"

local fruits = new set()
fruits:add("apple", "pear", "orange", "banana")
fmt.print("fruits  : %s", fruits)
local fruits2 = new set()
fruits2:add("melon", "orange", "lemon", "gooseberry")
fmt.print("fruits2 : %s", fruits2)
print()
fmt.print("fruits  contains 'banana'     : %s", fruits:contains("banana"))
fmt.print("fruits2 contains 'elderberry' : %s", fruits2:contains("elderberry"))
print()

fmt.print("Union        : %s", fruits:union(fruits2))
fmt.print("Intersection : %s", fruits:intersect(fruits2))
fmt.print("Difference   : %s", fruits:except(fruits2))
print()

fmt.print("fruits2 is a subset of fruits : %s", fruits2:subset(fruits))
print()

local fruits3 = fruits:copy()
fmt.print("fruits3 : %s", fruits3)
print()

fmt.print("fruits2 and fruits are equal : %s", fruits2:same(fruits))
fmt.print("fruits3 and fruits are equal : %s", fruits3:same(fruits))
print()

local fruits4 = new set()
fruits4:add("apple", "orange")
fmt.print("fruits4 : %s", fruits4)
print()
fmt.print("fruits3 is a proper subset of fruits : %s", fruits3:subset(fruits, true))
fmt.print("fruits4 is a proper subset of fruits : %s", fruits4:subset(fruits, true))
print()

local fruits5 = new set()
fruits5:add("cherry", "blueberry", "raspberry")
fmt.print("fruits5 : %s", fruits5)
print()
fruits5:add("guava")
fmt.print("fruits5 + 'guava'  : %s", fruits5)
fruits5:remove("cherry")
fmt.print("fruits5 - 'cherry' : %s", fruits5)