Check to see if an array is already sorted?

Question

I know how to put an array in order, but in this case I just want to see if it is in order. An array of strings would be the easiest, I imagine, and answer

Answer 1

reduce can compare each element to the one before, and stop when it finds one out of order:

array.reduce{|prev,l| break unless l[0] >= prev[0]; l}