Ruby array of arrays into array of hashes

Question

I have an array of arrays:

data = [
 ["Smith", "Bob", "Male"], 
 ["Jim", "Tim", "Male"],   
 ["Welch", "Anne", "Female"]
]

How would I convert it to look like:

data = [
 {:first_name => "Smith", :last_name => "Bob", :gender => "Male"},  
 {:first_name => "Jim", :last_name => "Tim", :gender => "Male"}, 
 {:first_name => "Welch", :last_name => "Anne", :gender => "Female"}
]

How did you get your AoA input? Can you share code you've tried to do the conversion? — Mark Thomas
– Mark Thomas, Commented Oct 26, 2017 at 1:08
data.map { |f, l, g| { :first_name => f, :last_name => l, :gender => g } } — Sagar Pandya
– Sagar Pandya, Commented Oct 26, 2017 at 1:17

JCorcuera · Accepted Answer · 2017-10-26 01:10:23Z

8

You can do something like this:

fields = [:first_name, :last_name, :gender]
data.map {|row| fields.zip(row).to_h }

#=> [{:first_name=>"Smith", :last_name=>"Bob", :gender=>"Male"}, {:first_name=>"Jim", :last_name=>"Tim", :gender=>"Male"}, {:first_name=>"Welch", :last_name=>"Anne", :gender=>"Female"}]

Keep in mind that this will only work if the elements are in the same order as the fields.

answered Oct 26, 2017 at 1:10

JCorcuera

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Comments

Ilya · Accepted Answer · 2017-10-26 03:18:10Z

1

Also you could use Struct:

presenter = Struct.new(:first_name, :last_name, :gender)
data.map { |e| presenter.new(*e).to_h }
#=> [{:first_name=>"Smith", :last_name=>"Bob", :gender=>"Male"}, 
#    {:first_name=>"Jim", :last_name=>"Tim", :gender=>"Male"}, 
#    {:first_name=>"Welch", :last_name=>"Anne", :gender=>"Female"}]

answered Oct 26, 2017 at 3:18

Ilya

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Comments

bishal · Accepted Answer · 2017-10-26 04:09:05Z

0

fields = [:first_name, :last_name, :gender]
data.map{|d| Hash[fields.zip(d)]}

answered Oct 26, 2017 at 4:09

bishal

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1 Comment

stone Over a year ago

While this may answer the question, it doesn't provide any context to explain how or why. Consider adding a sentence or two to explain your answer. This may help both the asker of this question, and generations of future coders who come across this answer. :-)

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