jasmine - Count the occurrence of each word in a phrase using javascript

Question

For example for the input "olly olly in come free"

The program should return:

olly: 2 in: 1 come: 1 free: 1

The tests are written as:

var words = require('./word-count');

describe("words()", function() {
  it("counts one word", function() {
    var expectedCounts = { word: 1 };
    expect(words("word")).toEqual(expectedCounts);
  });

//more tests here
});

1. How do I start in my word-count.js file? Create a method words() or a module Words() and make an expectedCount method in there and export it?

2. Do I treat the string as an array or an object? In the case of objects, how do I start breaking them into words and iterate for the count?

Answer 1

function count(str) {
  var obj = {};
  
  str.split(" ").forEach(function(el, i, arr) {
    obj[el] = obj[el] ? ++obj[el] : 1;
  });
  
  return obj;
}

console.log(count("olly olly in come free"));