By now you should feel pretty good working with strings, arrays and hashes. We’ll do a couple of classic “intro to programming” problems in the next few lessons to help solidify your knowledge and get warmed up to working on small projects. You’ll need to rely on some of your basic knowledge of conditionals and flow control from the prep work but you shouldn’t need to do anything you haven’t seen before.
Note: If you want to actually write and run your own Ruby code, you can either use IRB from the command line (type
irb after the prompt), or run it from a script file using
$ ruby ./your_file_name_in_the_current_directory.rb, or use the online editor at repl.it.
Implement a method
#stock_picker that takes in an array of stock prices, one for each hypothetical day. It should return a pair of days representing the best day to buy and the best day to sell. Days start at 0.
> stock_picker([17,3,6,9,15,8,6,1,10]) => [1,4] # for a profit of $15 - $3 == $12