Daily Quest reverseWords. Quest from https://daily-quest-tau.vercel.app

package.json

{
  "name": "daily-quest",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "jest"
  },
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "jest": "^29.7.0"
  }
}

reverse-words.js

// using built-in methods
function reverseWords(words) {
  return words.split(" ").reverse().join(" ")
}

// no built-in methods: .length, .split, .reverse, .join
function reverseWordsRaw(words) {
  let index = 0
  let currentCharacter = words[index]
  let currentWord = ""
  let wordList = []
  let wordCount = 0
  let outputString = ""
  
  // loop over each character to build a word list based on " " (space char)
  while (currentCharacter) {
    if (currentCharacter === " ") {
        wordList[wordCount] = currentWord
        currentWord = ""
        wordCount++
    } else {
      currentWord += currentCharacter
    }
    index++
    currentCharacter = words[index]
    // check for last iteration and push word
    if (!currentCharacter && currentWord) {
      wordList[wordCount] = currentWord
      wordCount++
    }
  }

  // clear current word and reset index count
  index = wordCount - 1
  // work backwords over our word list to build our output string
  while (index >= 0) {
    outputString += wordList[index]

    // determine if space is needed
    if (index - 1 >= 0) {
      outputString += " "
    }

    index--
  }


  return outputString
}

module.exports = reverseWords

reverse-words.test.js

const reverseWords = require('./reverse-words');

describe('reverseWords', () => {
  test('should reverse the words in a string', () => {
    expect(reverseWords('hello world and hello mars')).toEqual('mars hello and world hello');
  });

  test('should return single word if only one word is given', () => {
    expect(reverseWords('hello')).toEqual('hello');
  });

  test('should handle empty string', () => {
    expect(reverseWords('')).toEqual('');
  });

  // Add more tests as needed
});