単語数の出現回数をカウントする

word_count.rb

text =<<TEXT
The example above works as intended because the five instances of the (anonymous) inner function refer to five different instances of variable j. Note that it does not work as intended if you replace let by var or if you remove the variable j and simply use the variable i in the inner function.
TEXT

result = {}
result.default = 0
text.split(" ").map { |a| a.gsub(/\.$/, '').gsub(/\(|\)/, '').downcase }.sort.each { |b| result[b.to_sym]+=1 }

p result.sort {|(k1, v1), (k2, v2)| v2 <=> v1 }

結果

[[:the, 6], [:variable, 3], [:if, 2], [:as, 2], [:of, 2], [:you, 2], [:intended, 2], [:instances, 2], [:inner, 2], [:five, 2], [:function, 2], [:j, 2], [:i, 1], [:in, 1], [:example, 1], [:does, 1], [:different, 1], [:it, 1], [:by, 1], [:let, 1], [:not, 1], [:note, 1], [:because, 1], [:or, 1], [:refer, 1], [:remove, 1], [:replace, 1], [:simply, 1], [:that, 1], [:anonymous, 1], [:to, 1], [:use, 1], [:var, 1], [:and, 1], [:work, 1], [:works, 1], [:above, 1]]