class IndexSet

Fuck using an array with set, that’s just straight dumb and not efficient

def add(item) 

def add(item)
    return if @hash.include?(item)
    @hash[item] = hash.size
    @hash
end

def each(&block) 

def each(&block)
    @hash.each_key(&block)
end

def empty? 

def empty?
    @hash.empty?
end

def include?(item) 

def include?(item)
    @hash.include?(item)
end

def initialize 

def initialize
    @hash = Hash.new
end

def join(delimiter = '') 

def join(delimiter = '')
    @hash.keys.join(delimiter)
end

def length 

def length
    @hash.size
end

def to_a 

def to_a
    @hash.dup
end