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readme.md

Frequency of occurrences

Design a method to find the frequency of occurences of any given word in a book

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index.js

module.exports = function (book, word) {
  var words = book.replace(/.,/, ' ').toLowerCase().split(' ');
  var dict = {}
  words.forEach(function(w) {
    if (dict[w]) {
      dict[w] += 1;
    } else {
      dict[w] = 1;
    };
  });
  return dict[word];
}

package.json

{
  "id": 10,
  "name": "Frequency of occurrences",
  "level": "basic",
  "author": "CareerCup"
}

test.js

var func = require("./");
var expect = require("expect.js")

describe("func", function () {
  var book = "State Senator Malcolm A. Smith, who rose to become the first black president of the State Senate, " +
         "and City Councilman Daniel J. Halloran III were arrested early Tuesday on charges of trying to illicitly " +
         "get Mr. Smith on the ballot for this year's mayoral race in New York City, according to federal prosecutors. " +
         "Mr. Smith, a Queens Democrat, and Mr. Halloran, a Queens Republican, were among a half-dozen people arrested by Federal Bureau of Investigation agents in the corruption case. " +
         "The others were Joseph J. Savino, the Bronx G.O.P. chairman; Vincent Tabone, vice chairman of the Queens Republican Party; " +
         "and Noramie F. Jasmin, the mayor of the Rockland County village of Spring Valley, and her deputy, Joseph A. Desmaret, according to a criminal complaint. " +
         "Mr. Smith, 56, was taken from his home in handcuffs by F.B.I. agents before sunrise and Mr. Halloran, " +
         "a lawyer, was arrested about the same time, law enforcement authorities said."

  it("should find frequency of word appeared", function() {
    expect(func(book, 'state')).to.equal(2);
    expect(func(book, 'the')).to.equal(10);
    expect(func(book, 'was')).to.equal(2);
    expect(func(book, 'were')).to.equal(3);
  });
});