FAQ: The Refactor Factory - Nice work!

Frequently Asked Questions Ruby FAQ
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This community-built FAQ covers the “Nice work!” exercise from the lesson “The Refactor Factory”.

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This exercise can be found in the following Codecademy content:

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FAQs on the exercise Nice work!

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2

Why did this return an array? I was expecting it to return the first 10 primes (which it did) but I did not expect them to be bracketted! :
require ‘prime’
def first_n_primes(n)
return “n must be an integer.” unless n.is_a? Integer
return “n must be greater than 0.” unless n > 0
Prime.first n
end

puts first_n_primes(10)

3

From the Ruby docs for Prime at Class: Prime (Ruby 2.5.1) , you’ll see that Prime is enumerable, the set of all the prime numbers, which you can use array methods on, so you choose the first n using .first Class: Array (Ruby 2.4.1)

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