Combining two arrays into a hash

Question

I'm trying to combine two arrays into a hash.

@sample_array = ["one", "Two", "Three"]
@timesheet_id_array = ["96", "97", "98"]

I want to output the results into a hash called @hash_array. Is there a simple way to combine the two in a code block so that if you call puts at the end it looks like this in the console

{"one" => "96", "Two" => "97", "Three" => "98"}

I think this could be done in one or two lines of code.

Rahul · Accepted Answer · 2013-08-23 06:22:53Z

41

try this

keys = [1, 2, 3]
values = ['a', 'b', 'c']
Hash[keys.zip(values)]

thanks

edited Aug 23, 2013 at 6:22

Rahul

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answered Oct 2, 2012 at 17:30

Paritosh Singh

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4 Comments

tokland Over a year ago

+1, but it's a been a long time since you can write Hash[keys.zip(values)]

tokland Over a year ago

remove flatten or it won't work, Hash takes pairs. As a semantic nit-picking, I think it's important for collections to have plural names: keys and values.

Wayne Conrad Over a year ago

@tokland - It does work with flatten, in both MRI 1.8.7 and 1.9.3. You're right that it's not needed there (it used to be, once).

Petercopter Over a year ago

Hooray! I finally get to use zip! Ruby idioms for the win.

Ionut Hulub · Accepted Answer · 2012-10-02 17:29:55Z

8

@hash_array = {}
@sample_array.each_with_index do |value, index|
  @hash_array[value] = @timesheet_id_array[index]
end

answered Oct 2, 2012 at 17:29

Ionut Hulub

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1 Comment

tokland Over a year ago

@RubyDude1012: not that this is bad, but in a language where you have the abstractions zip and Hash in the core, definitely it's not the idiomatic way to do it.

Karol Selak · Accepted Answer · 2020-06-12 15:09:48Z

2

Imho that looks best:

[:a,:b,:c].zip([1,2,3]).to_h

# {:a=>1, :b=>2, :c=>3}

answered Jun 12, 2020 at 15:09

Karol Selak

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Comments

user191766 · Accepted Answer · 2012-10-02 17:26:06Z

1

Dr. Nic suggests 2 options explained well at http://drnicwilliams.com/2006/10/03/zip-vs-transpose/

answered Oct 2, 2012 at 17:26

user191766

1 Comment

tokland Over a year ago

only that the flattening is not needed anymore.

user1454117 · Accepted Answer · 2012-10-02 17:27:32Z

0

@hash_array = {}
0.upto(@sample_array.length - 1) do |index|
  @hash_array[@sample_array[index]] = @timesheet_id_array[index]
end
puts @hash_array.inspect

answered Oct 2, 2012 at 17:27

user1454117

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