My new (and much improved) solution to ex48, Learn Ruby by Zed Shaw!!!

you guys are gonna love this one :)

class Lexicon
def self.scan(input)
words = input.split
directions = [‘north’,’south’,’east’,’west’,’down’,’up’,’right’,’left’,’back’]
verbs = [‘go’,’stop’,’kill’,’eat’]
nouns = [‘door’,’bear’,’princess’,’cabinet’]
stop_words = [‘the’,’in’,’of’,’from’,’at’,’it’]
@@sentence = []

def self.push_to_sentence(word,type)
pair = [type , word]
@@sentence.push(pair)
end

def self.check_if_number(word)
if word.to_i.to_s == word
push_to_sentence(word.to_i,’number’)
else
push_to_sentence(word,’error’)
end
end

words.each do |word|
if directions.include? word
push_to_sentence(word,’direction’)
elsif verbs.include? word
push_to_sentence(word,’verb’)
elsif nouns.include? word
push_to_sentence(word,’noun’)
elsif stop_words.include? word
push_to_sentence(word,’stop’)
else
check_if_number(word)
end
end
return @@sentence
end
end