index.js

var typer = {
  words: ['Software Engineer at Amartha','Front-End Enthusiast', 'Fullstack Web ', 'Software Developer', 'Maker', 'Forward-Thinker' ],
  wordIndex: 0,
  speed: 150,
  nextWordWait: 1000,
  html: {
    word: document.querySelector('.myWord')
  },
  init: function init() {
    this.typeLetter();
  },
  typeLetter: function typeLetter() {
    var _this = this;

    var timer = arguments.length <= 0 || arguments[0] === undefined ? this.speed : arguments[0];

    setTimeout(function() {
      var word = {
        finished: _this.words[_this.wordIndex],
        current: _this.readWord()
      };

      var nextLetterIndex = word.finished.length - word.current.length;
      if (nextLetterIndex > 0) {
        nextLetterIndex = word.finished.length - nextLetterIndex;
        var nextLetter = word.finished[nextLetterIndex];
        _this.html.word.innerHTML += nextLetter;
        _this.typeLetter();
        return;
      }
      _this.nextWord();
    }, timer);
  },
  readWord: function readWord() {
    return this.html.word.innerHTML;
  },
  clearWord: function clearWord() {
    this.html.word.innerHTML = '';
  },
  nextWord: function nextWord() {
    var _this2 = this;

    this.wordIndex++;
    if (this.wordIndex == this.words.length) {
      this.wordIndex = 0;
    }
    setTimeout(function() {
      _this2.clearWord();
      _this2.typeLetter(_this2.nextWordWait);
    }, this.nextWordWait);
  }
};

typer.init();