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@musicm122
Created June 21, 2016 04:44
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open System
open System.Globalization
//---------------------------------------------------------------
// Apply Your Knowledge!
//
// Below is a list containing comma separated data about
// Microsoft's stock prices during March of 2012. Without
// modifying the list, programatically find the day with the
// greatest variance between the opening and closing price.
//
// The following functions may be of use:
//
// abs - takes the absolute value of an argument
//
// System.Double.Parse - converts a string argument into a
// numerical value.
//
// Hint: Use CultureInfo.InvariantCulture to always parse '.' as
// the decimal point.
//
// The following function will convert a comma separated string
// into an array of the column values.
//
// let splitCommas (x:string) =
// x.Split([|','|])
//---------------------------------------------------------------
let stockData =
[ "Date,Open,High,Low,Close,Volume,Adj Close";
"2012-03-30,32.40,32.41,32.04,32.26,31749400,32.26";
"2012-03-29,32.06,32.19,31.81,32.12,37038500,32.12";
"2012-03-28,32.52,32.70,32.04,32.19,41344800,32.19";
"2012-03-27,32.65,32.70,32.40,32.52,36274900,32.52";
"2012-03-26,32.19,32.61,32.15,32.59,36758300,32.59";
"2012-03-23,32.10,32.11,31.72,32.01,35912200,32.01";
"2012-03-22,31.81,32.09,31.79,32.00,31749500,32.00";
"2012-03-21,31.96,32.15,31.82,31.91,37928600,31.91";
"2012-03-20,32.10,32.15,31.74,31.99,41566800,31.99";
"2012-03-19,32.54,32.61,32.15,32.20,44789200,32.20";
"2012-03-16,32.91,32.95,32.50,32.60,65626400,32.60";
"2012-03-15,32.79,32.94,32.58,32.85,49068300,32.85";
"2012-03-14,32.53,32.88,32.49,32.77,41986900,32.77";
"2012-03-13,32.24,32.69,32.15,32.67,48951700,32.67";
"2012-03-12,31.97,32.20,31.82,32.04,34073600,32.04";
"2012-03-09,32.10,32.16,31.92,31.99,34628400,31.99";
"2012-03-08,32.04,32.21,31.90,32.01,36747400,32.01";
"2012-03-07,31.67,31.92,31.53,31.84,34340400,31.84";
"2012-03-06,31.54,31.98,31.49,31.56,51932900,31.56";
"2012-03-05,32.01,32.05,31.62,31.80,45240000,31.80";
"2012-03-02,32.31,32.44,32.00,32.08,47314200,32.08";
"2012-03-01,31.93,32.39,31.85,32.29,77344100,32.29";
"2012-02-29,31.89,32.00,31.61,31.74,59323600,31.74"; ]
// Feel free to add extra [<Koan>] members here to write
// tests for yourself along the way. You can also try
// using the F# Interactive window to check your progress.
//[ "Date, Open,High,Low, Close,Volume,Adj Close";
type Row =
{ DOE : string
Open : float
High : float
Low : float
Close : float
Volume : float
AdjClose : float }
let splitCommas (x:string) =
x.Split([|','|])
let createRowFromCSV (x : string) =
let rowData = splitCommas x
{ DOE = rowData.[0]
Open = System.Double.Parse rowData.[1]
High = System.Double.Parse rowData.[2]
Low = System.Double.Parse rowData.[3]
Close = System.Double.Parse rowData.[4]
Volume = System.Double.Parse rowData.[5]
AdjClose = System.Double.Parse rowData.[6] }
(*
let rec checkForGreatestVal index max dt =
let row = splitCommas stockData.[index]
let diff = abs( row.[1] - row.[5])
let diffDate = row.[0]
if diff > max then
checkForGreatestVal (index-1) diff diffDate
else
checkForGreatestVal (index-1) max dt
*)
let YouGotTheAnswerCorrect() =
let rows = Seq.map (fun row -> createRowFromCSV row ) stockData.Tail
let diff = Seq.map (fun item -> (item.DOE, abs (item.Open - item.Close))) rows
let result = Seq.maxBy snd diff |> fst
result
let output= YouGotTheAnswerCorrect()
output.Dump()
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