FAQ: Blocks, Procs, and Lambdas - Keeping Your Code DRY

This community-built FAQ covers the “Keeping Your Code DRY” exercise from the lesson “Blocks, Procs, and Lambdas”.

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This exercise can be found in the following Codecademy content:

Learn Ruby

FAQs on the exercise Keeping Your Code DRY

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Bonjour !
Merci pour le cours de Ruby, très ludique et facile à comprendre.

I have an issue with Proc
I don’t really understand how the Proc works.

multiples_of_3 = Proc.new do |n|
n % 3 == 0
end

print (1…100).to_a.select(&multiples_of_3)

How can we write the same thing without the Proc?

Hi, Just to reply the question you defined in English, it would look like this -

print (1...100).to_a.select {|n|
   n % 3 == 0
}

Without procs we are just passing a block of code to the method “select” here.
To put DRY in place, we would want to use procs, that would just replace the block of code with the variable that stores the block of code.
You can call the same using “&” notation.

print (1…100).to_a.select(&multiples_of_3)

Correct me if I am wrong, I am still new, learning Ruby and its fun so far. Hope you find this explanation useful.

Can anyone explain why we use to_a in this example? Calling print (1..100).select(&multiples_of_3) without .to_a seems to return the same result (still an array of numbers) and I’m curious the reasoning for this as I’m new to Ruby.

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