Problem 3

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 =

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