Convert strings into number values within subarrays

Question

My goal is to convert letters within words in an array into their corresponding number values so that:

["I", "like", "elephants"]

turns into

[[18], [21, 18, 20, 14], [14, 21, 14, 25, 17, 10, 23, 29, 28]]

How can I attain my goal?

This is my current code:

words = ["I", "like", "elephants"]
seperate_words = []
converted_words = []

words.each do |word|
  seperate_words.push(word.split(//))
end
puts seperate_words.to_s

seperate_words.each do |word|
  word.each do |letter|
    converted_words.push(letter.to_i 36)
  end
end
puts converted_words.to_s

I cannot separate the words as sub-arrays; I get:

[18, 21, 18, 20, 14, 14, 21, 14, 25, 17, 10, 23, 29, 28]

Marek Lipka · Accepted Answer · 2018-10-03 09:20:07Z

2

You need to introduce intermediate array, where you can store the results of operation on a single word:

separate_words.each do |word|
  converted_word = []
  word.each do |letter|
    converted_word.push(letter.to_i(36))
  end
  converted_words.push(converted_word)
end

answered Oct 3, 2018 at 9:20

Marek Lipka

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Comments

Ursus · Accepted Answer · 2018-10-03 09:30:29Z

2

Basically what you want is a transformation (map). First, I split every word in an array of characters. then, every letter of every array of character becomes an integer.

words = ["I", "like", "elephants"]
words.map(&:chars).map { |letters| letters.map { |letter| letter.to_i 36 } }

edited Oct 3, 2018 at 9:30

answered Oct 3, 2018 at 9:23

Ursus

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6 Comments

Ursus Over a year ago

Basically what you want is a transformation. First, I split every word in an array of characters. then, every letter of every array of character becomes an integer.

Marek Lipka Over a year ago

That's a good one, why don't you put this explanation in answer itself?

Kris Over a year ago

You could also do it as such words.map { |w| w.chars.map { |c| c.to_i(36) } }.

Benisburgers Over a year ago

Is there any way for me to use this function to do the oppsite, i.e. to convert the numbers back into letters?

Benisburgers Over a year ago

That is, once I've converted them from letters to numbers, how do I convert the numbers back to letters? @Ursus

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