Ruby - Converting Multiple arrays to generate a Hash

Question

I'm trying to convert 3 different arrays into a single Hash.

Here are the 3 arrays

@vehicle_numbers = ["Registration Number 1", "Registration Number 2", "Registration Number 1"]
@vehicle_colors = ["red", "blue", "green"]
@allocated = [true, true, true]

What I'm trying to achieve is

{1=> ["Registration Number 1", "red", true], 2=> ["Registration Number 2", "blue", true]}

So far, I have achieved this

{1=> ["Registration Number 1", "red"], 2=>["Registration Number 2", "red"]}

I'm trying to add allocated key into the existing hash, but I'm not able to figure out, what is wrong with it.

@lines.each do |line|
      @method_name = line.split[0]
      if @method_name == "park"
        @vehicle_numbers << @vehicle_number = line.split[1]
        @vehicle_colors << @vehicle_color = line.split[2]
        @vehicle_info["#{@vehicle_number}"] = @vehicle_color
        # puts @vehicle_info["#{@vehicle_number}"] = @vehicle_color
      end
    end
    @slots = 1.step(@vehicle_numbers.count, 1).to_a
    @vehicle_info = Hash[(@slots).zip @vehicle_info ]
    @slots.each do |slot|
      puts "Allocated slot number: #{slot}"
    end
    puts @vehicle_info

"So far, I have achieved this" - it usually helps expose what exact problem you have if you post the code that you used to achieve it. — Amadan
– Amadan, Commented Aug 15, 2018 at 9:54
@Amadan Yup. I was in transit, hence could not paste the code at that point. I have updated what I have tried and it's messy. — Kedarnag Mukanahallipatna
– Kedarnag Mukanahallipatna, Commented Aug 15, 2018 at 11:38

Arup Rakshit · Accepted Answer · 2018-08-15 10:01:17Z

5

You can do it in one line.

@vehicle_numbers.zip(@vehicle_colors, @allocated).each.with_index(1).to_h.invert
# => {1=>["Registration Number 1", "red", true], 2=>["Registration Number 2", "blue", true], 3=>["Registration Number 1", "green", true]}

answered Aug 15, 2018 at 10:01

Arup Rakshit

119k30 gold badges270 silver badges328 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Leo · Accepted Answer · 2018-08-15 10:05:06Z

4

[@vehicle_numbers, @vehicle_colors, @allocated].transpose.map.with_index { |a, i| [i + 1, a] }.to_h

answered Aug 15, 2018 at 10:05

Leo

1,7731 gold badge15 silver badges15 bronze badges

1 Comment

Aleksei Matiushkin Over a year ago

with_index accepts an argument: with_index(1) { |a, i| [i, a] }.to_h.

Igor Drozdov · Accepted Answer · 2018-08-15 09:56:35Z

2

What about just iterating with index over @vehicle_numbers and get other values by that index?

@vehicle_numbers.map.with_index do |vehicle_number, index|
  [index + 1, [vehicle_number,  @vehicle_colors[index], @allocated[index]]]
end.to_h

answered Aug 15, 2018 at 9:56

Igor Drozdov

15.1k5 gold badges39 silver badges55 bronze badges

Comments

Aleksei Matiushkin · Accepted Answer · 2018-08-15 10:11:10Z

1

Just out of curiosity:

(1..3).zip(
  [@vehicle_numbers, @vehicle_colors, @allocated].transpose
).to_h

answered Aug 15, 2018 at 10:11

Aleksei Matiushkin

121k12 gold badges109 silver badges173 bronze badges

Comments

Cryptex Technologies · Accepted Answer · 2018-08-21 07:43:35Z

0

You can try this one. It works for me.

hash = (1..3).zip([@vehicle_numbers.map(&:to_s), @vehicle_colors.map(&:to_s), @allocated].transpose).to_h

answered Aug 21, 2018 at 7:43

Cryptex Technologies

1,1639 silver badges16 bronze badges

Collectives™ on Stack Overflow

Ruby - Converting Multiple arrays to generate a Hash

5 Answers 5

Comments

1 Comment

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

5 Answers 5

Comments

1 Comment

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related