CODEWITHSUNDEEP
ruby
Mark
Mark

Reputation: 13

Why do I get this "syntax error, unexpected tIDENTIFIER" error message from my Ruby code?

Can someone please explain me why this code not working? I dont realy know much about ruby yet so hope you can help. It says I have syntax error in puts multi[is]:

syntax error, unexpected tIDENTIFIER, expecting keyword_do or '{' or '<' puts multi[is]

Here's the code:

        # multi = Array.new
        # multi[0] = Array.new(2, 'hello') 
        # # multi[1] = Array.new(2, 'world')
        # puts(multi[0])
        # puts(multi[1])

        multi = ['hest','hund','kat','fugl'] # names of animals
        for i in multi # convert to 
          is = i.to_i
          is++
          # puts(i. inspect
          puts multi[is]   # her i have error says  syntax error, unexpected tIDENTIFIER, expecting keyword_do or '{' or '<' puts
          multi[is]
        end


        food = Array.new # a new arry

        # 0 milk  names for food
        # 1 ost
        # 2 kod
        # 3 ris

Upvotes: 0

Views: 903

Answers (2)

Arup Rakshit
Arup Rakshit

Reputation: 118299

Your is++ is the one causing error. Just write it is+=1. In ruby there is no -- or ++ operator.

Straight from the documentation :

Ruby has no pre/post increment/decrement operator. For instance, x++ or x-- will fail to parse. More importantly, ++x or --x will do nothing! In fact, they behave as multiple unary prefix operators: -x == ---x == -----x == ...... To increment a number, simply write x += 1.

I re-written your code with some modification :

multi = ['hest','hund','kat','fugl'] # names of animals
index=-1
for name in multi
  p "#{name} at #{index+=1}"
end
# >> "hest at 0"
# >> "hund at 1"
# >> "kat at 2"
# >> "fugl at 3"

Upvotes: 3

kiddorails
kiddorails

Reputation: 13014

Arup has already answered the question, but I wish to add the Rubyish tinge to your code which doesn't follow it's conventions. 

multi = ['hest','hund','kat','fugl'] # names of animals

multi.each_with_index do |m, i|
  puts "#{i+1} #{m}"
end

each_with_index is Ruby enumerator which provides you with two block variables, one for element (here, m) and one for index of corresponding element(here, i)

Keep rubying. :)

Upvotes: 1

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