Multi dim array?

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

On 10/20/06, Gijs N. [email protected] wrote:

end

Does:
some_alphabet.detect {|e| e == “c”}[1]
…do what you’re looking for?

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”,“â ?”], [“c”,“â ?”], [“d”,“â ?”],
[“e”,“â ?”], [“f”,“â ?”], [“g”,“â ?”], [“h”,“â ?”], [“i”,“â ?”], [“j”,“â ?”], [“k”,
“â ?”], [“l”,“â ?”], [“m”,“⠍”], [“n”,“⠝”], [“o”,“â ?”], [“p”,“⠏”], [“q”,“â ?”],
[“r”,“â ?”], [“s”,“â ?”], [“t”,“â ?”], [“u”,“â ¥”], [“v”,“â §”], [“w”,“â º”],
[“x”,“â ­”], [“y”,“â ½”], [“z”,“â µ”], [" “, " “] ]
braille_alphabet = { “a”=>“⠁”, “b”=>“â ?”, “c”=>“â ?”, “d”=>“â ?”,
“e”=>“â ?”, “f”=>“â ?”, “g”=>“â ?”, “h”=>“â ?”, “i”=>“â ?”, “j”=>“â ?”, “k”=>“â ?”,
“l”=>“â ?”, “m”=>“⠍”, “n”=>“⠝”, “o”=>“â ?”, “p”=>“⠏”, “q”=>“â ?”, “r”=>“â ?”,
“s”=>“â ?”, “t”=>“â ?”, “u”=>“â ¥”, “v”=>“â §”, “w”=>“â º”, “x”=>“â ­”, “y”=>“â ½”,
“z”=>“â µ”, " “=>” " }
#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 B. wrote:

On 10/20/06, Gijs N. [email protected] wrote:

end

Does:
some_alphabet.detect {|e| e == “c”}[1]
…do what you’re looking for?

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

Gijs N. wrote:

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

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