Message Mixer Codecademy solution javascript

message.js

import { countCharacter, capitalizeFirstCharacterOfWords, reverseWord, reverseAllWords, replaceFirstOccurence, replaceAllOccurrences, encode, palindrome, pigLatin} from './messageMixer';
function displayMessage() {
  console.log(countCharacter("What is the color of the sky?", "t"));
  console.log(capitalizeFirstCharacterOfWords("What is the color of the sky?"));
  console.log(reverseWord("What is the color of the sky?"));
  console.log(reverseAllWords("What is the color of the sky?"));
  console.log(replaceFirstOccurence("What is the color of the sky?", "sky", "water"));
  console.log(encode("What is the color of the sky?"));
  console.log(palindrome("What is the color of the sky?"));
  console.log(pigLatin("What is the color of the sky?", "yq "));
}
displayMessage();

messageMixer.js

function countCharacter(inputString, inputCharacter) {
  let count = 0;
  let string = inputString.toLowerCase();
  let character = inputCharacter.toLowerCase();
    for (let i = 0; i < string.length; i++) {
      if (string[i] === character) {
         count++;
      }
    }
  return count; 
};
function reverseAllWords(sentence) {
  let words = sentence.split(" ");
    for (let i = 0; i < words.length; i++) {
      words[i] = reverseWord(words[i]);
    }
   return words.join(" ");
};
function capitalizeFirstCharacterOfWords(string) {
  let arr = string.split(" ");  
    for (let i = 0; i < arr.length; i++) {  
      let word = arr[i];
        arr[i] = word[0].toUpperCase() + word.substring(1); 
    }
  return arr.join(" "); 
};
function reverseWord(word) {
  return word.split("").reverse().join("");
};
function reverseAllWords(sentence) {
  let words = sentence.split(" ");
    for (let i = 0; i < words.length; i++) {
      words[i] = reverseWord(words[i]);
    }
   return words.join(" ");
};
function replaceFirstOccurence(string, toBeReplaced, replaceWith) {
  return string.replace(toBeReplaced, replaceWith);
};
function replaceAllOccurrences(string, toBeReplaced, replaceWith) {
  return string.split(toBeReplaced).join(replaceWith);
};
function encode(string) {
  let replacementObject = { "a": "@", "s": "$", "i": "!", "o":"0" };
    for (let key in replacementObject) {
      string = replaceAllOccurrences(string, key, replacementObject[key]); 
    }	
    return string;
};

function palindrome  (str){
    return `${str} ${reverseWord(str)}`;
  }
 function pigLatin(sentence, character){
    return sentence.split(' ').join(character + ' ');
}

export {countCharacter, capitalizeFirstCharacterOfWords, reverseWord, reverseAllWords, replaceFirstOccurence, replaceAllOccurrences, encode, palindrome, pigLatin};