#ruby beginner

My goal for today is to work on Hartl's tutorial. Not sure how much I'll be able to finish in a day, but I'm going to keep on going till I'm done. 

Problem Statement

Write a Towers of Hanoi game. Keep three arrays, which represent the piles of discs. Pick a representation of the discs to store in the arrays; maybe just a number representing their size. In a loop, prompt the user (using gets) and ask what pile to select a disc from, and where to put it. After each move, check to see if they have succeeded in moving all the discs, to the final pile. If so, they win!

Solution

PEGS = { "a" => [3, 2, 1], "b" => [], "c" => [] } # Method to display pegs def displaypegs() puts "Peg A = " + PEGS["a"].to_s puts "Peg B = " + PEGS["b"].to_s puts "Peg C = " + PEGS["c"].to_s puts "" end # Method to perform user move def usermove(from, to) # If FROM peg is empty, there is no disk to move. Display error message to user if PEGS[from].count == 0 puts "From peg is empty, please choose a different peg!" # If the disk the user is trying to move is larger than the disk on the TO peg, # don't allow the move. Users can be so sneaky at times ;) elsif (PEGS[to].count != 0) && PEGS[from].last > PEGS[to].last puts "Don't be sneaky, you can't do that!" # if everything looks ok, just pop the FROM peg and push disk to the TO peg else PEGS[to] << PEGS[from].pop end end def hanoi() # Display the initial state of the pegs displaypegs() # Initialize WIN to false. You haven't won the game yet ;) win = false # Since you haven't won the game yet, maybe you should play till you win? while !win # Get user input. Store from and to pegs to perform operations on them later puts "Which peg do you want to pick the disk from?" from = gets.chomp.downcase puts "Which peg to you want to put the disk on?" to = gets.chomp.downcase # Make the move based on user input usermove(from, to) # Display the pegs to show the latest move displaypegs() # Check if user won if PEGS["c"] == [3, 2, 1] win = true puts "Congrats, you won :)" puts "" end end end

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Just got back from my first Rails Girls Atlanta meetup. Let’s just say, it was a good learning experience. Before I go on though, James Holder had an awesome presentation this evening. The practical, and innovative ways that ruby is being used is exciting, and inspiring.