Passing arguments to functions in ruby using variables?

The basic idea you haven't seemed to grasp is passing arguments to functions. Assume we have two global variables and we wish to perform identical operations on them - say multiply elements of arrays by 2. You write.

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Following the tutorial Zed A. Shaw, I'm writing a soccer game. My code so far is as follows: $team_a_players = "Basar", "Mehmet", "Abdullah", "Alpaslan", "Salih", "Recep", "Ibrahim", "Orhan", "Hakki", "Yakup", "Serdar" $team_a_substitutes = "Hasan", "Turgay", "Umit" $team_b_players = "Habib", "Erkan", "Sahin", "Cemal", "Ahmet", "Fikret", "Yucel", "Pergel", "Ali", "Sabri", "Yilmaz" $team_b_substitutes = "Abdulkadir", "Gokhan", "Mustafa" $yellow = $red = $reasons = "corner", "direct attack", "free kick", "side attack", "speed kick" $team_a_attack = 90.0 $team_a_defense = 80.0 $team_b_attack = 70.0 $team_b_defense = 60.0 $team_a_goals = 0 $team_b_goals = 0 def prompt() print "> " end def dice() if rand(2) == 0 round_team_a() else round_team_b() end end def fauls() if rand(0) > 0.95 and rand(10) % 2 == 0 faul_player = $team_a_playersrand(11) if $yellow.

Include?(faul_player) $red. Push(faul_player) $team_a_players. Delete("faulplayer") puts "#{faul_player} of Team A gets a red card in #{$i}.

Minute! " puts "Who would you like to substitute in place of #{faul_player}? " list_subs_a() prompt() substitute = STDIN.gets.chomp() $team_a_players.

Push("substitute") $yellow. Delete(faul_player) else $yellow. Push(faul_player) puts "#{faul_player} of Team A gets a yellow card in #{$i}.

Minute! " end elsif rand(0) > 0.95 and rand(10) % 2 == 1 faul_player = $team_b_playersrand(11) if $yellow. Include?(faul_player) $red.

Push(faul_player) $team_b_players. Delete("faulplayer") puts "#{faul_player} of Team B gets a red card in #{$i}. Minute!

" puts "Who would you like to substitute in place of #{faul_player}? " list_subs_b() prompt() substitute = STDIN.gets.chomp() $team_b_players. Push("substitute") $yellow.

Delete(faul_player) else $yellow. Push(faul_player) puts "#{faul_player} of Team B gets a yellow card in #{$i}. Minute!

" end else faul_player = nil end end def list_subs_a() $team_a_substitutes. Each {|p| puts p} end def list_subs_b() $team_b_substitutes. Each {|p| puts p} end def list_yellow() $yellow.

Each {|p| puts p} end def list_red() $red. Each {|p| puts p} end def round_team_a() score = $team_a_attack / $team_b_defense * rand(0) if score > 1 goal = 1 $team_a_goals += 1 reason = $reasonsrand(5) puts "Team A scored #{goal} goal through a #{reason} in #{$i}. Minute!

" else goal = 0 end end def round_team_b() score = $team_b_attack / $team_a_defense * rand(0) if score > 1 goal = 1 $team_b_goals += 1 reason = $reasonsrand(5) puts "Team B scored #{goal} goal through a #{reason} in #{$i}. Minute! " else goal = 0 end end def match() $i = 0 until $i > 59 do dice() fauls() $i += 1 end puts "Team A scored a total of #{$team_a_goals} goals and Team B scored a total of #{$team_b_goals} goals.

" if $team_a_goals > $team_b_goals puts "Team A won against Team B by #{$team_a_goals}:#{$team_b_goals}! " elsif $team_b_goals > $team_a_goals puts "Team B won against Team A by #{$team_b_goals}:#{$team_b_goals}! " else puts "It's a tie!

" end if $yellow. Length > 0 puts "Players shown a yellow card are:" list_yellow() else puts "No yellow cards in the end of the game" end if $red. Length > 0 puts "Players shown a red card are:" list_red() else puts "No red cards in the end of the game" end end match() From here, I would like to do the following: Replace the arrays $yellow and $red with hashes so that I can also report minutes and teams of yellow- and red-cards.

Replace the arrays starting with the name $team_ with hashes so that I can add individualized attack- and defense-powers to players so that substitutions mean sth. But before the code gets any more complex, I have to solve sth. This looks similar to this question concerning php.

Define the functions list, round and faul in a way that can be used common to a_players and b_players . I tried doing team_#{team}_players instead of team_a_players etc, but cannot achieve it. What I seek is a guide to that problem, not a solution, so that I can fix this myself.

A link or long explanation in clear words is very much more welcome than a fixed code. And please note that the tutorial has not mentioned classes yet, so this is not an option yet. Ruby function arguments argument-passing link|improve this question edited Mar 11 at 15:05Marcin9,12131528 asked Mar 10 at 12:31barerd468 89% accept rate.

6 If the ebook taught you to create all those global variables, I'd probably try a different book ;) I know you're new to ruby, but if there's one thing I could tell you to try and get right early, it would be to think about your code in terms of small units (Player, Team, Substitute, Match, Score, etc...) and to limit the data you externalize in those units to whatever is needed to glue everything together. Using global variables gets out of hand quickly, as you can see from your variable names. – d11wtq Mar 10 at 12:50 No, the book is certainly not guilty.

Actually I even read this link about global variables but couldn't get the whole thing since I lack basics of computer programming. But thank you for reminding me of this. – barerd Mar 11 at 19:29.

The basic idea you haven't seemed to grasp is passing arguments to functions. Assume we have two global variables and we wish to perform identical operations on them - say multiply elements of arrays by 2. You write: $a = 1,2,3 $b = 2,3,4 def multiply_a result = for element in $a do result First of all, you should note that in Ruby $a is a special variable - a global variable.

You should never need to use them - writing code containing them means that there is something wrong with it. So how to fix it? The basic idea is to pass an argument to a function, instead of hard coding the variable, the function operates on.

So you can transform the code as follows: a = 1, 2, 3 be = 2, 3, 4 def multiply(argument) result = for element in argument do result.

Now I get the thing, thank you. – barerd Mar 11 at 20:02 I fixed the code according to your suggestion and got rid of the globals. But this also costs me the methods.

Could you very mind to check THE NEW CODE ON THIS PAGE and tell me if I'm in the right track or not. *PS: this is a one time request, I promise. – barerd Mar 11 at 23:41 I am afraid, that this is not what you should do.

Don't remove the methods, just make them accept parameters. – Aleksander Pohl Mar 12 at 0:55 Thank you for responding. I made the methods accept parameters, but if you don't mind, could you just check the final version and tell me if the passing of variable "min" is the proper way to do it?

The document is here – barerd Mar 12 at 13:58.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.