Multi dim array?

ruby-talk
1

Hi (again),

I have a multi-dimensional array.. walking through an incoming string
like this:

def translate(msg)
  some_alphabet = [ ["a","A"], ["b","B"], ["c","C"], ["d","D"] ]
  msg.split(//).inject("") { |result, char|
    result += some_alphabet[2][1]
  }
end

This replaces everything in msg with a "C", as it's the third one in the
array.
But I'm looking for a way to replace not by integer/index but by char,
like:

some_alphabet["c"][1]

I hope you know what I mean.. I looked at at() and find() and scan() but
neither seems to fit this task?

Thanks!

Gijs

···

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2

Does:
some_alphabet.detect {|e| e == "c"}[1]
..do what you're looking for?

···

On 10/20/06, Gijs Nijholt <gijs.nijholt@gmail.com> wrote:

Hi (again),

I have a multi-dimensional array.. walking through an incoming string
like this:

def translate(msg)
  some_alphabet = [ ["a","A"], ["b","B"], ["c","C"], ["d","D"] ]
  msg.split(//).inject("") { |result, char|
    result += some_alphabet[2][1]
  }
end

This replaces everything in msg with a "C", as it's the third one in the
array.
But I'm looking for a way to replace not by integer/index but by char,
like:

some_alphabet["c"][1]

I hope you know what I mean.. I looked at at() and find() and scan() but
neither seems to fit this task?

3

Gijs Nijholt wrote:

Hi (again),

I have a multi-dimensional array.. walking through an incoming string like this:

def translate(msg)
  some_alphabet = [ ["a","A"], ["b","B"], ["c","C"], ["d","D"] ]
  msg.split(//).inject("") { |result, char|
    result += some_alphabet[2][1]
  }
end

This replaces everything in msg with a "C", as it's the third one in the array.
But I'm looking for a way to replace not by integer/index but by char, like:

some_alphabet["c"][1]

I hope you know what I mean.. I looked at at() and find() and scan() but neither seems to fit this task?

Is this what you want?

irb(main):001:0> "message".tr 'abc', 'CBA'
=> "messCge"

Or are you looking for an even more general mapping mechanism? In that case you could use a Hash

irb(main):002:0> r={"a"=>"B","e"=>"X"}
=> {"a"=>"B", "e"=>"X"}
irb(main):003:0> "message".gsub(/./) {|k| r[k]||k}
=> "mXssBgX"

Kind regards
  
  robert

4

hm, tried several things with detect() and they all gave a nil error
when least expected error..
so I thought maybe I need to switch to Hash instead of Array?

excuse me for posting the entire function, but this is what I've made of
it:

  def translate_to_braille(msg)
    #braille_alphabet = [ ["a","⠁"], ["b","⠃"], ["c","⠉"], ["d","⠙"],
["e","⠑"], ["f","⠋"], ["g","⠛"], ["h","⠓"], ["i","⠊"], ["j","⠚"], ["k",
"⠅"], ["l","⠇"], ["m","⠍"], ["n","⠝"], ["o","⠕"], ["p","⠏"], ["q","⠟"],
["r","⠗"], ["s","⠎"], ["t","⠞"], ["u","⠥"], ["v","⠧"], ["w","⠺"],
["x","⠭"], ["y","⠽"], ["z","⠵"], [" ", " "] ]
    braille_alphabet = { "a"=>"⠁", "b"=>"⠃", "c"=>"⠉", "d"=>"⠙",
"e"=>"⠑", "f"=>"⠋", "g"=>"⠛", "h"=>"⠓", "i"=>"⠊", "j"=>"⠚", "k"=>"⠅",
"l"=>"⠇", "m"=>"⠍", "n"=>"⠝", "o"=>"⠕", "p"=>"⠏", "q"=>"⠟", "r"=>"⠗",
"s"=>"⠎", "t"=>"⠞", "u"=>"⠥", "v"=>"⠧", "w"=>"⠺", "x"=>"⠭", "y"=>"⠽",
"z"=>"⠵", " "=>" " }
    #msg.split(//).inject("") { |result, char| result +=
braille_alphabet.first }
    msg.split(//).inject("") { |result, char|
      result += char + " " + braille_alphabet["r"]
    }
  end

the braille_alphabet["r"] nicely gives it's value, but when I replace it
with braille_alphabet[char] Ruby says:
can't convert nil into String

why?
char is not nil, because when I print it, it contains a character..

Wilson Bilkovich wrote:

···

On 10/20/06, Gijs Nijholt <gijs.nijholt@gmail.com> wrote:

end

Does:
some_alphabet.detect {|e| e == "c"}[1]
..do what you're looking for?

--
Posted via http://www.ruby-forum.com/\.

5

nevermind, it does work but something else was throwing nil errors..
sorry!

···

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