Creating a method in Ruby that takes in an array and returns a string

Question

How would you solve this problem in Ruby. "Define a method called yeller that takes in an array of characters and returns a string with an ALLCAPS version of the input. Verify that yeller([’o’, ’l’, ’d’]) returns "OLD". Combine the .join, .map, .upcase methods."

So far I have:

def yeller(x) 
  x.map do |y|  
  y.upcase.join     
    puts y
  end
end
yeller(['o', 'l', 'd'])

Another note, in ruby you can also do %w(o l d) instead of ['o', 'l', 'd']. — Eli Sadoff
– Eli Sadoff, Commented Nov 11, 2016 at 21:02

Ursus · Accepted Answer · 2016-11-12 17:04:02Z

7

It's so simple

def yeller(x)
  x.join.upcase
end

yeller(['o', 'l', 'd'])
 => "OLD"

join makes your character list a string and upcase makes that string uppercase

edited Nov 12, 2016 at 17:04

answered Nov 11, 2016 at 21:00

Ursus

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Comments

CyberMew · Accepted Answer · 2018-05-15 07:23:20Z

1

This is the answer from the textbook where you got the question from.

def yeller(chars)
  chars.map(&:upcase).join
end
yeller(['o', 'l', 'd'])
=> "OLD"

answered May 15, 2018 at 7:23

CyberMew

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Comments

borbesaur · Accepted Answer · 2016-11-12 16:52:39Z

-1

try this

def yeller(x)
  imsupercool = x.map do |y|
    y.upcase
  end
   imsupercool.join
end
puts yeller(['o', 'l', 'd'])

edited Nov 12, 2016 at 16:52

answered Nov 11, 2016 at 20:58

borbesaur

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2 Comments

steenslag Over a year ago

"Define a method called yeller that takes in an array of characters and returns a string(...)" . This returns nil (because puts returns nil).

Sagar Pandya Over a year ago

remove the puts from the method definition and use puts before calling the function i.e. puts yeller(['o','l','d'])

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