I was confused because there was a split in the Array

When I wrote the following code, the array of arrays came back and I was confused.

numbers.split(/,/) #=> [["1","2","3"]]

The cause was that I was calling split for a split array.

numbers = "1,2,3".split(/,/)
numbers.split(/,/) #=> [["1","2","3"]]

Rails Active Support provides Array # split. It splits an array into an array of arrays before and after a particular value.

[1, 2, 3, 4, 5].split(3) # => [[1,2],[4,5]]

However, if the variable was supposed to contain a string but was an array, it would be annoying.

def include_three?(string)
  string.split(/,/).include?("3")
end

include_three?("1,2,3,4,5".split(/,/)) #=> false

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