Joining the values of keys in array - Ruby

Question

I am noob in ruby and have an array of hashes as per below. Say my array is @fruits_list:

[
    {:key_1=>15, :key_2=>"Apple"}, 
    {:key_1=>16, :key_2 =>"Orange"}, 
    {:key_1=>17, :key_2 =>"Cherry"}
]

What I am looking for is to join the names of the fruits. I did @fruits_list[:key_2].join('|')

and I am getting the error as "TypeError:no implicit conversion of Symbol into Integer"

Please suggest.

Arup Rakshit · Accepted Answer · 2014-02-19 18:24:12Z

3

Use Array#collect first to collect names of fruits, then join them with a pipe | using Array#join

@fruits_list = [
                  {:key_1=>15, :key_2=>"Apple"}, 
                  {:key_1=>16, :key_2 =>"Orange"}, 
                  {:key_1=>17, :key_2 =>"Cherry"}
               ]
@fruits_list.collect { |hsh| hsh[:key_2] }.join("|")
# => "Apple|Orange|Cherry"

@fruits_list is an array of hash(s). Elements of an array can be accessed via the integer indexes only. But you tried to access it with a symbol :key_2, thus it raised an error as "TypeError:no implicit conversion of Symbol into Integer".

edited Feb 19, 2014 at 18:24

answered Feb 19, 2014 at 18:13

Arup Rakshit

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4 Comments

tech_human Over a year ago

Thanks for helping. Looking at the error I understood what the issue was but wasn't able to get through the solution. Another method I tried was getting each object out of the array and then doing a join on it which was again incorrect because I was trying to join value of :key_2 of one object but the other object was not ready yet. Anyways this helped a lot!! Thanks!!

tech_human Over a year ago

My requirement on this has changed a bit. I am now checking if the value is nil, then I wouldn't be including it in the list or collect. Eg: In the example in your reply, say {:key_1=>17, :key_2 => " "}; then I wouldn't include this in my list. My final list should be {"Apple" | "Orange"} and not {"Apple" | "Orange" | " "}. I tried this, @fruits_list.collect { |hsh| hsh[:key_2] unless hsh[:key_2].nil? }.join("|") but its still returning the nil value. What am I doing wrong here?

tech_human Over a year ago

oh okay. I will do that. Since it was related to this, I added it here.

tech_human Over a year ago

I created it here - stackoverflow.com/questions/22716604/…

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