word frequency in javascript

Question

How can I implement javascript function to calculate frequency of each word in

Answer 1

const sentence = 'Hi my friend how are you my friend';

const countWords = (sentence) => {
    const convertToObject = sentence.split(" ").map( (i, k) => {
        return {
          element: {
              word: i,
              nr: sentence.split(" ").filter(j => j === i).length + ' occurrence',
          }

      }
  });
    return Array.from(new Set(convertToObject.map(JSON.stringify))).map(JSON.parse)
};

console.log(countWords(sentence));