characterFrequency.js

// Description
// Welcome, Warrior! In this kata, you will get a message and you will need to get the frequency of each and every character!

// Explanation
// Your function will be called char_freq/charFreq/CharFreq and you will get passed a string, you will then return a dictionary (object in JavaScript) with as keys the characters, and as values how many times that character is in the string. You can assume you will be given valid input.

// Example
// charFreq("I like cats") // Returns {'a': 1, ' ': 2, 'c': 1, 'e': 1, 'I': 1, 'k': 1, 'l': 1, 'i': 1, 's': 1, 't': 1}

function charFreq(message) {
  return message.split("").reduce((total, letter) => {
    total[letter] ? total[letter]++ : (total[letter] = 1);
    return total;
  }, {});
}

function charFreq(message) {
  let arr = message.split("");
  let item = {};
  for (let i = 0; i < arr.length; i++) {
    if (!item[arr[i]]) {
      item[arr[i]] = 1;
    } else item[arr[i]]++;
  }
  return item;
}