Adding length or each string in array and creating a new array with result appended

Question

I need to do the following:

Write a function that takes a String and returns an Array/list with the length of each word added to each element

Examples:

add_length('apple ban') => ["apple 5", "ban 3"]  
add_length('you will win') => ["you 3", "will 4", "win 3"]

I can find the length of each word but my question is, how do I then create a new array appending the lengths to each respective element? I think i need to use map again, but I am not sure how...

This is how I have worked out the lengths:

def add_length(str)  
   str.split(" ").map(&:length).to_s
end

Yu Hao · Accepted Answer · 2015-07-12 14:39:20Z

3

A little modification could make it work:

'apple ban'.split(" ").map {|w| w + ' ' + w.length.to_s}
# => ["apple 5", "ban 3"]

answered Jul 12, 2015 at 14:39

Yu Hao

123k50 gold badges253 silver badges305 bronze badges

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

1 Comment

KVyas Over a year ago

Thank you! That worked, I was struggling with parameters

spickermann · Accepted Answer · 2015-07-12 14:58:18Z

2

You can use string interpolation to avoid string concatination and to_s calls. Futhermore there is no need for the (" ") argument when you use split to split strings at whitespaces:

def add_length(words)
  words.split.map { |word| "#{word} #{word.length}" }
end

answered Jul 12, 2015 at 14:58

spickermann

108k9 gold badges115 silver badges147 bronze badges

Comments

Wand Maker · Accepted Answer · 2015-07-12 14:45:19Z

1

Use collect method

def add_length(str)

   str.split(" ").collect { |e| e + ' ' + e.length.to_s }

end

p add_length('apple ban')

Output:

["apple 5", "ban 3"]

answered Jul 12, 2015 at 14:45

Wand Maker

18.8k9 gold badges58 silver badges90 bronze badges

Collectives™ on Stack Overflow

Adding length or each string in array and creating a new array with result appended

3 Answers 3

1 Comment

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

1 Comment

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related