CODEWITHSUNDEEP
ruby
Gabriel Lidenor
Gabriel Lidenor

Reputation: 2985

How do I reverse words not the characters using Ruby?

I want to reverse the words of a text file:

If my input is:

Hello World

My output should be:

World Hello

I tried this: 

File.open('teste.txt').each_line do |line|
  print line.reverse.gsub(/\n/,"")
end

but I got the characters reversed.

Upvotes: 0

Views: 3318

Answers (3)

IHazABone
IHazABone

Reputation: 525

Split the string on spaces, reverse it, then join them together.

You could make a method to do it as such:

def reverse_words(string)
      return string.split(" ").reverse.join(" ")
end

then later, call that method with:

print reverse_words("Hello World")

Or set a string to the returned value:

reversed_string = reverseWords("Hello World")

Upvotes: 0

Niels B.
Niels B.

Reputation: 6310

"Hello World".split.reverse.join(" ")
=> "World Hello"

It splits the string into an array with a whitespace being the default delimiter. Then it reverses the array and concatenates the strings in the array using a white space as well.

Your solution should look like this:

File.open("test.txt").each_line do |line|
  puts line.split.reverse.join(" ")
end

puts appends a linebreak after the output, while print does not. This is neccessary, because split discards the original linebreak on each line, when splitting it into an array of words.

Upvotes: 10

Sergio Tulentsev
Sergio Tulentsev

Reputation: 230336

Break string into words and reverse that. 

"Hello World".split.reverse.join(' ') # => "World Hello"

Upvotes: 2

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