Question

Given:

shipping_costs = {
  key1: 45,
  key2: 99,
  key3: nil,
  key4: 24
}

What’s the cleanest way to get the max of those keys assuming nil = 0?

If I run a straight shipping_costs.values.max in the Rails console I get this:

ArgumentError: comparison of Fixnum with nil failed

Cleanest way to turn those nils into zeros before running max?

Answer 1

I’d go for:

shipping_costs.values.map(&:to_i).max

nil.to_i is 0.