FAQ: The Refactor Factory - Omit Needless Words

This community-built FAQ covers the “Omit Needless Words” exercise from the lesson “The Refactor Factory”.

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Continuing the discussion from FAQ: The Refactor Factory - Omit Needless Words:

I don’t understand what’s the problem with my code, can somebody help me please?

I think you’re meant to refactor the original unless into a single line unless statement, and the original if into a single line if.

You have refactored into two ifs. :slight_smile:

Don't click me without trying again first!

This passed for me:

require 'prime'   # This is a module. We'll cover these soon!

def first_n_primes(n)

  return "n must be an integer." unless n.is_a? Integer
  return "n must be greater than 0." if n <= 0

  return Prime.first n


Oh ok thank you so much!

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Can someone tell me why we must use return instead of puts? And why if didn’t print in the console?

Use “return” instead of “puts” it will work.

Why do you need to use explicit returns in this exercise?

Explicit returns are needed when they are not on the last line of the method. There are two returns for invalid entries and one final, implicit return of the Prime number array.


That makes sense!!! Thanks!

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