CODEWITHSUNDEEP
rubyarrays
Alextoul
Alextoul

Reputation: 839

Ruby - Arrays - What would be a smart way to do this:

if country == "Switzerland"
      icon_link = "ch"
    elsif country == "Poland"
      icon_link = "pl" 
    elsif country == "Germany"
      icon_link = "de"
    elsif country == "Spain"
      icon_link = "sp"
    elsif country == "Japan"
      icon_link = "jp"
    elsif country == "Kazakhstan"
      icon_link = "kz"  
    elsif country == "Hong Kong"
     icon_link = "hk" 
    elsif country == "China"
      icon_link = "cn"
    end
    image_tag("icons/flags/#{icon_link}.png",options)

I'm guessing I would need to create an array and use the keys but don't figure out how to do it.

Thanks for your help.

Upvotes: 0

Views: 134

Answers (4)

knut
knut

Reputation: 27845

For your special need, I would recommend the Hash-solution in the other answers.

As an alternative you may use case instead the if-elsif-construct.

case country 
  when "Switzerland"
    icon_link = "ch"
  when "Poland"
    icon_link = "pl" 
  when "Germany"
    icon_link = "de"
  when "Spain"
    icon_link = "sp"
  when "Japan"
    icon_link = "jp"
  when "Kazakhstan"
    icon_link = "kz"  
  when "Hong Kong"
   icon_link = "hk" 
  when "China"
    icon_link = "cn"
end

You can integrate case also as paramter:

image_tag("icons/flags/%s.png" % case country 
  when "Switzerland"
    "ch"
  when "Poland"
    "pl" 
  when "Germany"
    "de"
  when "Spain"
    "sp"
  when "Japan"
    "jp"
  when "Kazakhstan"
    "kz"  
  when "Hong Kong"
   "hk" 
  when "China"
    "cn"
  else
    "dummy"
end, options)

Upvotes: 1

jefflunt
jefflunt

Reputation: 33954

In Ruby, a Hash can do this. In other languages, similar functionality is sometimes called an "associative array". Basically they take a key (in your case the country) and a value (the locale code, such as 'cn').

Declare the hash:

country_codes = {"Switzerland" => "ch",      "Poland" => "pl", etc.... }
                    / key \     / value \     / key \   /value\

With the hash declared above:

country_codes["Switzerland"] => "ch"

Then you use it like:

image_tag("icons/flags/#{country_codes[country]}.png",options)

See: http://www.troubleshooters.com/codecorn/ruby/basictutorial.htm#_Hashes

Upvotes: 1

Digikata
Digikata

Reputation: 1959

You likely want a Hash:

# do this part once to load your hash
countryCode = {
  "Switzerland" => "ch",
  "Germany"     => "de",
  # ...
}

# generate the image_tag call
if( countryCode.has_key?( country ) )
  image_tag( "icons/flags/#{countryCode[country]}.png",options)
else
  # country code not in your hash
end

Upvotes: 4

Adnan
Adnan

Reputation: 2967

 icon_links = { "Switzerland" => "ch",
                "Poland"=> "pl",
                "Germany" => "de",
                "Spain" => "sp",
                "Japan" => "jp",
                "Kazakhstan" => "kz",  
                "Hong Kong" => "hk", 
                "China" => "cn"}
 icon_link = icon_links[country]
 image_tag("icons/flags/#{icon_link}.png",options)

Upvotes: 1

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