Ruby > Inject method > Accumulating strings in an array

Question

All,

New to Ruby and playing around. Here's my array:

fruits = ["banana", "apple", "pear", "orange"]

I accumulated like this:

longest_sentence = fruits.inject("banana") do |memo, fruit|
  if memo == fruits[0]
    puts "I like " + fruit + "s and "
  else
    puts fruit + "s and "
  end
end

As expected, it gave me this:

I like bananas and 
apples and 
pears and 
oranges and 
=> nil

Here's are my two questions:

How would you condense this code into a single line (i.e.no code block)?
How would you display the results as a single string (i.e. "I like bananas and apples and pears and oranges and" without the awkward line returns)?

Thanks!

"I like apples and oranges and" is invalid english :)

Sergio Tulentsev
– Sergio Tulentsev

2016-02-14 21:20:33 +00:00
Commented Feb 14, 2016 at 21:20 — Sergio Tulentsev
– Sergio Tulentsev, Commented Feb 14, 2016 at 21:20

Jordan Running · Accepted Answer · 2016-02-14 22:20:24Z

2

The argument you pass to reduce should be the initial value you want memo to have. In this case, it looks like you want it to be "I like". Additionally, don't do puts inside the block. reduce (like map et al) is for "building" objects. Once you're done, then print the string you built:

sentence = fruits.inject("I like") do |memo, fruit|
  memo << " #{fruit}s and"
end

puts sentence
# => I like bananas and apples and pears and oranges and

edited Feb 14, 2016 at 22:20

answered Feb 14, 2016 at 22:08

Jordan Running

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Sergio Tulentsev · Accepted Answer · 2016-02-14 21:17:03Z

0

You don't need inject/reduce for this.

fruits = ["banana", "apple", "pear", "orange"]
puts "I like " + fruits.map{|f| f + 's'}.join(' and ') 
# >> I like bananas and apples and pears and oranges

answered Feb 14, 2016 at 21:17

Sergio Tulentsev

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Comments

Sergio Tulentsev · Accepted Answer · 2016-02-17 07:53:10Z

0

puts "I like #{fruits.join('s and ')}s" 
  #-> I like bananas and apples and pears and oranges

or

puts "I like %ss" % fruits.join("s and ")

edited Feb 17, 2016 at 7:53

Sergio Tulentsev

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answered Feb 15, 2016 at 2:41

Cary Swoveland

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