mostFrequentWordChallenge created by Luke_Rogerson - https://repl.it/@Luke_Rogerson/mostFrequentWordChallenge

index.js

const _ = require('lodash');

function highestWordCount (str) {

let resultArray = str.replace(/[.,\/#!$%\^&\*;:{}=\-_`~()0-9]/g, "").split(' ');

let words = {};

for (word of resultArray) {
  let counter = 0;
  for (word2 of resultArray) {
    if (word === word2) {
      counter++;
      words[word] = counter
    }
  }
}

let sortedByValue = _.transform (words, function(result, value, key) {
  (result[value] || (result[value] = [])).push(key);
}, {});

return (sortedByValue[Object.keys(sortedByValue)[Object.keys(sortedByValue).length - 1]]);


}



highestWordCount('I see, mmm... I see, 2 and 2.');

package-lock.json

{
  "requires": true,
  "lockfileVersion": 1,
  "dependencies": {
    "lodash": {
      "version": "4.17.11",
      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.11.tgz",
      "integrity": "sha512-cQKh8igo5QUhZ7lg38DYWAxMvjSAKG0A8wGSVimP07SIUEK2UO+arSRKbRZWtelMtN5V0Hkwh5ryOto/SshYIg=="
    }
  }
}

A simple function to return the most frequent word (or words) in a string.