Replace string with values from two arrays (in Ruby)

Question

Question

I saw this same question at Replace string with values from two arrays and thought I'd ask and respond to it in Ruby code (as the question was in Javascript)

I have a string for example:

str = 'This is a text that needs to change'

and two arrays:

arr0 = %w[a e i o u]
arr1 = %w[1 2 3 4 5]

I want to replace characters in str and arr0 with their corresponding arr1 values. The output should be:

'Th3s 3s 1 t2xt th1t n22ds to ch1ng2'

Since I plan to use this with large chunks of data, I expect the solution to be efficient.

Solution

str.gsub(Regexp.new(/[#{arr0.join('')}]/), Hash[[arr0, arr1].transpose])
=> "Th3s 3s 1 t2xt th1t n22ds t4 ch1ng2"

Feel free to share your solution to this problem =)

Matt · Accepted Answer · 2014-01-28 00:27:15Z

5

str.tr arr0.join, arr1.join
# => Th3s 3s 1 t2xt th1t n22ds t4 ch1ng2

answered Jan 28, 2014 at 0:27

Matt

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2 Comments

Hieu Le Over a year ago

Hi @Matt! i think it is good in his case. But in this case: text = "[A] and [B]", original = ["[A]", "[B]", "[C]", "[D]", "[Aa]"], replacements = ["[B]", "[C]", "[D]", "[E]", "[Bb]"] How can you replace the text to "[B] and [C]"

Matt Over a year ago

@Ronan That requires pattern matching and substitution, instead of the simple tr method. Best to ask that as a separate question.

Cary Swoveland · Accepted Answer · 2014-01-28 01:19:21Z

1

I would do it either as @Matt has, or like this:

str = 'This is a text that needs to change'
h = {"a"=>"1", "e"=>"2", "i"=>"3", "o"=>"4", "u"=>"5"}

str.gsub /[#{h.keys.join}]/, h
  #  => "Th3s 3s 1 t2xt th1t n22ds t4 ch1ng2"

answered Jan 28, 2014 at 1:19

Cary Swoveland

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Comments

bjhaid · Accepted Answer · 2014-01-28 00:26:05Z

0

if the indexes of the vowel remains unchanged:

str = 'This is a text that needs to change'
%w[a e i o u].each_with_index { |x,i| str.gsub!(x,(i+1).to_s)}
str # => "Th3s 3s 1 t2xt th1t n22ds t4 ch1ng2"

answered Jan 28, 2014 at 0:26

bjhaid

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