Re: [External] How to compare a hash key with a string value

I think I see your problem, Minh.

Your hashes (elements of your array of hashes, actually), seems to be in JSON format and doesn't produce the Ruby Hash with the keys that you expect.

{"label":"Name"} is the same as { :label => "Name" } because the Ruby syntax for a Hash literal looks like {key: value} where the key is always a symbol.  It is also true that :"key" is an alternate way of defining a Symbol literal.

If you change your loop to be:

hash.each.with_index(1) do |person,i|
  puts "Person is #{i}"
  if person.key? :width
    puts "The value of width is #{person[:width]}"
  end
end

I think that you'll get the result that you were expecting.

Alternatively, you could replace the Hash literal syntax with:

hash = [{"label" => "Name","value" => "Bob","identifier" => "field2","type" => "oneLineText","page" => 1,"page_name" => "Step 1","width" => "100%"},
        {"label" => "Email","value" => "[email protected]","identifier" => "field3","type" => "email","page" => 1,"page_name" => "Step 1","width" => "100%"},
        {"label" => "Phone Number","value" => "","identifier" => "field7","type" => "oneLineText","page" => 1,"page_name" => "Step 1","width" => "100%"},
        {"label" => "Comments","value" => "some information about the compagny","identifier" => "field5","type" => "textarea","page" => 1,"page_name" => "Step 1","width" => "100%"},
       ]

And your original code that expected keys that were Strings would work.

-Rob


> On 2019-Oct-23, at 14:01 , Tran, Minh <[email protected]> wrote:
> 
> Thank you so much Jonathan for all of the helps.
> I tried your code and it gave me the person number such as
> person 1 , person 2, ete; but it does not give me the value of the
> person.has_key?('width') on each of the person.
> 
> I still try to figure out why it did not execute this piece of code
> 
>  if person.has_key?('width')
> 
>    puts "The value of width is #{person['width']}"
> 
>  end
> 
> 
> My original program is as followed:
> 
> 
> 
> hash = [{"label":"Name","value":"Bob","identifier":"field2","type":"oneLineText","page":1,"page_name":"Step 1","width":"100%"},{"label":"Email","value":"[email protected] <mailto:[email protected]>","identifier":"field3","type":"email","page":1,"page_name":"Step 1","width":"100%"},{"label":"Phone Number","value":"","identifier":"field7","type":"oneLineText","page":1,"page_name":"Step 1","width":"100%"},{"label":"Comments","value":"some information about the compagny","identifier":"field5","type":"textarea","page":1,"page_name":"Step 1","width":"100%"}]
> 
> 
> 
> 
> 
> 
> hash.each_with_index do |person, i|
> 
>  puts "Person is #{i}"
> 
>  
> 
>  if person.has_key?('width')
> 
>    puts "The value of width is #{person['width']}"
> 
>  end
> 
> 
> From: ruby-talk <[email protected]> on behalf of Jonathan Fagan <[email protected]>
> Sent: Wednesday, October 23, 2019 1:48 PM
> To: Ruby users <[email protected]>
> Subject: [External] Re: How to compare a hash key with a string value
>  
> I am not 100% clear on the question, but you could possibly just do something like this?
> 
> hash.each_with_index do |person, i|
>  puts "Person is #{i}"
>  
>  if person.has_key?('width')
>    puts "The value of width is #{person['width']}"
>  end
> 
> end
> 
> On Wed, Oct 23, 2019 at 10:36 AM Tran, Minh <[email protected] <mailto:[email protected]>> wrote:
> Hello,
>     I am having a scenario which I want to print out the value of a hash element when its key equals to a string value such as "width".
> I try several alternatives but so far I have had a good result.
> So if you know on how to do , please share it with me.
> 
> My hash table array looks like as the following:
> 
> hash = [{"label":"Name","value":"Bob","identifier":"field2","type":"oneLineText","page":1,"page_name":"Step 1","width":"100%"},{"label":"Email","value":"[email protected] <mailto:[email protected]>","identifier":"field3","type":"email","page":1,"page_name":"Step 1","width":"100%"},{"label":"Phone Number","value":"","identifier":"field7","type":"oneLineText","page":1,"page_name":"Step 1","width":"100%"},{"label":"Comments","value":"some information about the compagny","identifier":"field5","type":"textarea","page":1,"page_name":"Step 1","width":"100%"}]
> 
> 
> My Ruby code is as the following where I need to print out the hash value when the hash key equals to "width" 
> 
> 
> i = 0
> hash.each do |person|
>  i += 1
>  puts "Person is #{i}"
>  person.each do |key, value|
>    
>     if key == "width"
>       puts "The value of width is #{value}"
>     end
>     
>     
>   end
> end
> 
> 
> 
> Thanks in advance for all of the helps.
> Dun
> 
> 
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