my_inject refactored for /u/zaclacgit

my_inject.rb

  def my_inject(initial = nil, sym = nil)
    memo, starter = initial, self if initial && block_given? 
    memo, starter = self[0], self[1..-1] if initial.nil? || !block_given?
    starter.push(initial) unless sym.nil? || block_given? 
    starter.my_each do |x|
      if sym
        memo = memo.send(sym, x)
      elsif block_given?
        memo = yield(memo,x)
      else
        memo = memo.send(initial, x)
      end
    end
    memo
  end

  # OR
  
  def my_inject(initial = nil, sym = nil)
    if initial && block_given?
      memo, starter = initial, self
    else
      memo, starter = self[0], self[1..-1]
    end
    starter.push(initial) unless sym.nil? || block_given? 
    starter.my_each do |x|
      if sym
        memo = memo.send(sym, x)
      elsif block_given?
        memo = yield(memo,x)
      else
        memo = memo.send(initial, x)
      end
    end
    memo
  end

the only difference between these two is the use of five lines for the leading if statement VS 2. The second one makes it clear that this is an either/or scenario but it's a bit longer, so it's really up to you to decide which you're looking for. Generally, the more readable solution is better.