[dmonroe4919]

I am supposed to write a code that sets an array of 9 elements to empty. This is the code I constructed:
module Thing
for a in (0...9)
@array[a] = :empty
end
end

but I keep getting the error undefined method [](line 3) for 'each'(line 2). How do I rearrange or fix this?

[erik.price]

In Ruby, you would probably want to use nil rather than :empty, since :empty is just an arbitrary symbol where nil is the actual lack of a value built into the language.

To append a value to an array, simply do @array << :empty

I personally would favor using a times block, like so (irb session):

>> 9.times { a << nil }
>> a
=> [nil, nil, nil, nil, nil, nil, nil, nil, nil]

How do you declare your array variable?

You should use one of these two, and need to declare it before the loop:

array = []
array = Array.new

Besides that, your code runs fine for me (as long as you declare the array beforehand):

>> a = []
>> for i in (0...9)
>> a[i] = :empty
>> end
>> a
=> [:empty, :empty, :empty, :empty, :empty, :empty, :empty, :empty, :empty]

[dorknexus]

even better!!:

a = [1,2,3,4,5,6,7,8,9]
a.map { nil}

[erik.price]

Same principle, but slightly more concise!

a = (0...9).to_a.map {nil}

And something I should have remembered in the first place:

a = Array.new 9, nil
#sets a to 9 elements, each of which are nil