SpeechRecognitionEvent.resultIndex
Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
  The resultIndex read-only property of the
  SpeechRecognitionEvent interface returns the lowest index value result in
  the SpeechRecognitionResultList "array" that has actually changed.
  The SpeechRecognitionResultList object is not an array, but it has a
  getter that allows it to be accessed by array syntax.
Value
A number.
Examples
recognition.onresult = function(event) {
  var color = event.results[0][0].transcript;
  diagnostic.textContent = 'Result received: ' + color + '.';
  bg.style.backgroundColor = color;
  console.log(event.resultIndex); // returns 0 if there is only one result
}
Specifications
| Specification | 
|---|
| Web Speech API # dom-speechrecognitionevent-resultindex | 
Browser compatibility
BCD tables only load in the browser