javascript virtual assistant scrip[t

JavaScript
const startBtn = document.createElement("button");
startBtn.innerHTML = "Start listening";
const result = document.createElement("div");
const processing = document.createElement("p");
document.write("<body><h1>My Siri</h1><p>Give it a try with 'hello', 'how are you', 'what's your name', 'what time is it', 'stop', ... </p></body>"); 
document.body.append(startBtn);
document.body.append(result);
document.body.append(processing);

const SpeechRecognition = window.SpeechRecognition || window.webkitSpeechRecognition;

if (typeof SpeechRecognition === "undefined") {
  startBtn.remove();
  result.innerHTML = "<b>Browser does not support Speech API. Please download latest chrome.<b>";
}

const recognition = new SpeechRecognition();
recognition.continuous = true;
recognition.interimResults = true;

function process(speech_text) {
    return "....";
}
recognition.onresult = event => {
   const last = event.results.length - 1;
   const res = event.results[last];
   const text = res[0].transcript;
   if (res.isFinal) {
      processing.innerHTML = "processing ....";
      const response = process(text);
      
      const p = document.createElement("p");
      p.innerHTML = `You said: ${text} </br>Siri said: ${response}`;
      processing.innerHTML = "";
      result.appendChild(p);
      // add text to speech later
   } else {
      processing.innerHTML = `listening: ${text}`;
   }
}

let listening = false;
toggleBtn = () => {
   if (listening) {
      recognition.stop();
      startBtn.textContent = "Start listening";
   } else {
      recognition.start();
      startBtn.textContent = "Stop listening";
   }
   listening = !listening;
};
startBtn.addEventListener("click", toggleBtn);

function process(rawText) {
   // remove space and lowercase text
   let text = rawText.replace(/\s/g, "");
   text = text.toLowerCase();
   let response = null;
   switch(text) {
      case "hello":
         response = "hi, how are you doing?"; break;
      case "what'syourname":
         response = "My name's Siri.";  break;
      case "howareyou":
         response = "I'm good."; break;
      case "whattimeisit":
         response = new Date().toLocaleTimeString(); break;
      case "stop":
         response = "Bye!!";
         toggleBtn(); // stop listening
   }
   if (!response) {
      window.open(`http://google.com/search?q=${rawText.replace("search", "")}`, "_blank");
      return "I found some information for " + rawText;
   }
   return response;
}

speechSynthesis.speak(new SpeechSynthesisUtterance(response));
Source