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// Advanvced Part 3 about Mr T. Drumb investing into stocks
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//==========================================================
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//two test portfolios
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val blchip_portfolio = List("GOOG", "AAPL", "MSFT", "IBM", "FB", "YHOO", "AMZN", "BIDU")
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val rstate_portfolio = List("PLD", "PSA", "AMT", "AIV", "AVB", "BXP", "CBG", "CCI",
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"DLR", "EQIX", "EQR", "ESS", "EXR", "FRT", "GGP", "HCP")
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def get_yahoo_page(url: String): Option[List[String]] = ...
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def get_first_price(symbol: String, year: Int): Option[Double] = ...
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def get_prices(portfolio: List[String], years: Range): List[List[Option[Double]]] = ...
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//val p = get_prices(List("GOOG", "AAPL"), 2010 to 2012)
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def get_delta(price_old: Option[Double], price_new: Option[Double]): Option[Double] = ...
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def get_deltas(data: List[List[Option[Double]]]): List[List[Option[Double]]] = ...
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//val d = get_deltas(p)
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def yearly_yield(data: List[List[Option[Double]]], balance: Long, year: Int): Long = ...
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//yearly_yield(d, 100, 0)
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def compound_yield(data: List[List[Option[Double]]], balance: Long, year: Int): Long = ...
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def investment(portfolio: List[String], years: Range, start_balance: Long): Long = ...
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//investment(rstate_portfolio, 1978 to 2016, 100)
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//investment(blchip_portfolio, 1978 to 2016, 100)
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