Reference no: EM13324583

Write a function word_count(s) that parses the string s into words and returns an array (of arrays of the form [word, count]) representing the frequency of each word. Words are case-insensitive:

'Hello', 'HELLO', and 'hello' are instances of the same word. It is helpful to write helper functions in addition to word_count.

The following processes the first paragraph of Alice in Wonderland. Note that res2 is an array of those words that occur at least twice in this paragraph.

some_text = <<SAMPLE_TEXT

Alice was beginning to get very tired of sitting by her sister on the bank,and of having nothing to do: once or twice she had peeped into the book her sister was reading, but it had no pictures or conversations in it," and what is the use of a book," thought Alice "without pictures or conversation?"

SAMPLE_TEXT

res = word_count(some_text)
print res, "\n\n"
res2 = res.select { |pair| pair[1] > 1 }
res2.sort.each do |key, count|
puts "#{key}: #{count}"
end

[["of", 3], ["or", 3], ["the", 3], ["alice", 2], ["and", 2], ["book", 2], ["had", 2], ["her", 2], ["it", 2], ["pictures", 2], ["sister", 2], ["to", 2], ["was",2], ["a", 1], ["bank", 1], ["beginning", 1], ["but", 1], ["by", 1], ["conversation", 1], ["conversations", 1], ["do", 1], ["get", 1], ["having", 1], ["in", 1],["into", 1], ["is", 1], ["no", 1], ["nothing", 1], ["on", 1], ["once", 1], ["peeped", 1], ["reading", 1], ["she", 1], ["sitting", 1], ["thought", 1], ["tired",1], ["twice", 1], ["use", 1], ["very", 1], ["what", 1], ["without", 1]]

alice: 2
and: 2
book: 2
had: 2
her: 2
it: 2
of: 3
or: 3
pictures: 2
sister: 2
the: 3
to: 2
was: 2