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[Ruby]: Update hash values with Array

Published by

Puneet Pandey

on

Hi Folks,

In this small tutorial, I am writing a program that updates value of each element in hash with a given array values.
Given that:
h = { h1: 'value1', h2: 'value2', h3: 'value3', h4: 'value4' }
a = [ '1', '2', '3', '4' ]
Where h is a Hash and a is an Array

Output we would like to achieve here is:
h = { h1: 'value1_1', h2: 'value2_2', h3: 'value3_3', h4: 'value4_4' }

Let’s code it:

h = { h1: 'value1', h2: 'value2', h3: 'value3', h4: 'value4' }
a = [ '1', '2', '3', '4' ]

h.each_with_index do |(k, v), i|
break if a.size > h.keys.size

a.each_with_index { |val, index|
if i == index
h[k] = v.to_s + ‘_’ + val.to_s
end
}
end

p h.inspect
# Output => h = { :h1 => “value1_1”, :h2 => “value2_2”, :h3 => “value3_3”, :h4 => “value4_4” }

class MyLittleProgram
def execute
h = { h1: 'value1', h2: 'value2', h3: 'value3', h4: 'value4' }
a = [ '1', '2', '3', '4' ]
h.each_with_index do |(k, v), i|
break if a.size > h.keys.size
a.each_with_index { |val, index|
if i == index
h[k] = v.to_s + '_' + val.to_s
end
}
end
end
end
e = MyLittleProgram.new
p e.execute
# Output => h = { :h1 => "value1_1", :h2 => "value2_2", :h3 => "value3_3", :h4 => "value4_4" }
view raw h_to_a_mapping.rb hosted with ❤ by GitHub

I’ve tried to minimize the number of loops here. Appreciate your feedback and suggestions.

Happy Coding! 🙂

One response to “[Ruby]: Update hash values with Array”

  1. budhramgurung Avatar
    budhramgurung

    Small and concise:
    h = { h1: ‘value1’, h2: ‘value2’, h3: ‘value3’, h4: ‘value4’ }
    a = [ ‘1’, ‘2’, ‘3’, ‘4’ ]

    h.each_with_index do |(k, v), i|
    break if a.size > h.keys.size
    a.each_with_index {|val, index| h[k] = “#{v}_#{val}” if i == index }
    end

    puts h

    Reply

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I’m Puneet

Namaste! I’m Puneet, and this is my digital space for all things tech. I dive deep into topics like backend engineering, software architecture, and how we build robust systems. I believe in writing simple, practical articles that you can learn from and apply. Let’s build something great together!

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