将数字推入Ruby中的数组

Question

I'm trying to create a program outputting each number and whether it is divisible by numbers 2-9. I'm doing this by iterating over 2-9 and pushing each number onto an array, however, an error shows up when compiling:

/Users/XXX/XXX/XXX/XXX.rb:3: warning: already initialized constant ArrayOfMultiples

How do I remove this error?

Here is my code:

(1..200).each do |number|
    output_str = ""
    ArrayOfMultiples = Array.new

    (2..9).each do |multiple|
        if number%multiple == 0 
        ArrayOfMultiples.push(multiple)
        end
    end

    output_str = number.to_s + " is divisble by " + ArrayOfMultiples.join(", ")
    puts output_str     

end

Answer 1

Start your variable with lower case, otherwise it is considered a constant. If you reinitialize a constant, you get that warning.

arrayOfMultiples

A simple program like the following can demonstrate this behaviour:

A = 1
A = 2

When you run the above script, it says:

test.rb:2: warning: already initialized constant A
test.rb:1: warning: previous definition of A was here

Answer 2

You could also make this a lot simpler:

(1..200).each do |x|
  divisible_by = (2..9).select {|y| x%y==0}
  puts "#{x}: #{divisible_by.join(", ")}"
end