卡在Ruby上的Code Academy

Question

I am doing Code Academy The Refactor Factory: Less is More (Exercise 4) module. Here are the instructions for the module:

Less is More Great work! This code looks better already.

We can remove even more, however. Recall that Ruby will implicitly (that is, automatically) return the value of the last expression it evaluates. There's one return statement in this code that we can change from explicit to implicit!

Instructions Find the unnecessary return statement and remove it.

Hint: it's the last one! This is because we may want to return early if the input isn't a positive number, and we can't return early unless we explicitly use the return keyword.

I tried to remove the last return statement and each of the others, and I get an error. Can anyone offer any suggestions?

$VERBOSE = nil    # We'll explain this at the end of the lesson.
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

  prime_array ||= []

  prime = Prime.new
  for num in (1..n)
    prime_array.push(prime.next)
  end
  return prime_array
end

first_n_primes(10)

Answer 1

取出return从return prime_array应该工作。