Ruby getting the longest word of a sentence

Question

I\'m trying to create method named longest_word that takes a sentence as an argument and The function will return the longest word of the sentence.

My c

Answer 1

Funcional Style Version

str.split(' ').reduce { |r, w| w.length > r.length ? w : r }

Another solution using max

str.split(' ').max { |a, b| a.length <=> b.length }