Filter an array by number?

Question

I've got an array with a list of numbers, e.g.

[10, 30, 50, 54, 56, 95, 97, 99] 

If I provide a number e.g. 52, it needs to return the next lowest number in the array, in this case that would be 50.

What's the cleanest way to do this?

Please state if the array must be sorted first.

Answer 1

I'd go for something like this (no need for sorting):

[10, 30, 50, 54, 56, 95, 97, 99].select {|n| n < 52}.max

Answer 2

I think this can work for a sorted array:

[10, 30, 50, 54, 56, 95, 97, 99].sort.reverse.find { |el| el < number }

It simply changes the sorting direction to descending and finds first smaller element