word_occurrences.js

/**
 * 
 * @param {string} text
 * 
 * Return a plain JS object providing the number of occurrences of every word containing at least 3 characters from the text 
 */
const wordOccurrences = (text) => { // functional programming version
  return text
    .split(' ')
    .filter((token) => token.length > 2)
    .reduce((acc, token) => ({
      ...acc,
      [token]: acc[token] ? acc[token] + 1 : 1
    }), {});
};

/*
const wordOccurrences = (text) => { // first version...
  const tokens = text.split(' ');

  const r = {};

  tokens.forEach((token) => {
    if (token.length <= 2)
      return;

    if (r[token] !== undefined)
      r[token] += 1;
    else
      r[token] = 1;
  });

  return r;
};
*/

module.exports = wordOccurrences;