speech.js

/*
https://rawgit.com/chrisritter/25faedd4c8fa569fc2f8/raw/speech.js
*/

//listen (callback)
window.listen = function(callback) {
  if(window.webkitSpeechRecognition) {
    var recognition = new webkitSpeechRecognition();
    recognition.onresult = function(e) { 
    	callback(e.results[0][0].transcript,
      		e.results[0][0].confidence);
          recognition.stop();
    }
    recognition.start();
  } else {
    var answer = prompt("What would you like to say?");
    callback(answer, 1);
  }
};

//talk
window.talk = function(text) {
	if(window.SpeechSynthesisUtterance) {
		var msg = new SpeechSynthesisUtterance();
		var voices = window.speechSynthesis.getVoices();
		//msg.voice = voices[10]; // Note: some voices don't support altering params
		msg.voiceURI = 'native';
		msg.text = text;
		msg.lang = 'en-US';
		speechSynthesis.speak(msg);
	} else {
		alert(text);
	}
};

if (!String.prototype.includes) {
  String.prototype.includes = function(search, start) {
    'use strict';
    if (typeof start !== 'number') {
      start = 0;
    }
    
    if (start + search.length > this.length) {
      return false;
    } else {
      return this.indexOf(search, start) !== -1;
    }
  };
}