Functional Programming: A PragPub Anthology

Revisiting an Earlier Example

Let’s put the parallel collection to a practical use. In Chapter 3, ​Scala and Functional Style​, we looked at concise code to fetch and process stock prices from Yahoo. Let’s revisit that code and make it run parallel.

For this example, we’ll use the following tickers:

val tickers = List("AAPL", "AMD", "CSCO", "GOOG", "HPQ", "INTC", "MSFT", "ORCL")

The code to fetch the price and construct it into a StockPrice object is repeated from that chapter here.

case class StockPrice(ticker : String, price : Double) {
  def print = println("Top stock is " + ticker + " at price $" + price)
}

def getPrice(ticker : String) = {
  val url = s"http://download.finance.yahoo.com/d/quotes.csv?s=${ticker}&f=snbaopl1" ...