Q49.js

// 804. Unique Morse Code Words

// International Morse Code defines a standard encoding where each letter is mapped to a series of dots and dashes, as follows:

// 'a' maps to ".-",
// 'b' maps to "-...",
// 'c' maps to "-.-.", and so on.
// For convenience, the full table for the 26 letters of the English alphabet is given below:

// [".-","-...","-.-.","-..",".","..-.","--.","....","..",".---","-.-",".-..","--","-.","---",".--.","--.-",".-.","...","-","..-","...-",".--","-..-","-.--","--.."]
// Given an array of strings words where each word can be written as a concatenation of the Morse code of each letter.

// For example, "cab" can be written as "-.-..--...", which is the concatenation of "-.-.", ".-", and "-...". We will call such a concatenation the transformation of a word.
// Return the number of different transformations among all words we have.

var uniqueMorseRepresentations = function (words) {
  let word = "";
  let answer = [];
  let mapped = {};
  let char = [
    "a",
    "b",
    "c",
    "d",
    "e",
    "f",
    "g",
    "h",
    "i",
    "j",
    "k",
    "l",
    "m",
    "n",
    "o",
    "p",
    "q",
    "r",
    "s",
    "t",
    "u",
    "v",
    "w",
    "x",
    "y",
    "z",
  ];
  let morse = [
    ".-",
    "-...",
    "-.-.",
    "-..",
    ".",
    "..-.",
    "--.",
    "....",
    "..",
    ".---",
    "-.-",
    ".-..",
    "--",
    "-.",
    "---",
    ".--.",
    "--.-",
    ".-.",
    "...",
    "-",
    "..-",
    "...-",
    ".--",
    "-..-",
    "-.--",
    "--..",
  ];

  for (let element in char) {
    mapped[`${char[element]}`] = morse[element];
  }

  for (let i = 0; i < words.length; i++) {
    for (let j = 0; j < words[i].length; j++) {
      word = word + mapped[words[i][j]];
    }
    answer.push(word);
    word = "";
  }

  answer = answer.filter((item, index) => answer.indexOf(item) === index);
  return answer.length;
};

let words = ["rwjje", "aittjje", "auyyn", "lqtktn", "lmjwn"];
console.log(uniqueMorseRepresentations(words));