JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://player.vimeo.com/api/player.js"></script>
<div id="made-in-ny1"></div>
<div id="made-in-ny2"></div>
<div id="made-in-ny3"></div>

JavaScript

var iframes = ['made-in-ny1', 'made-in-ny2', 'made-in-ny3']

 var options = {
        url: 'https://vimeo.com/76979871'
    };

var videos = [];
var videos_flags = [];

function bindValue (n, videos) {
	return function() {
        alert(n)
        videos_flags[n] = true;
    }
}

for( var i = 0 ; i < iframes.length ; i++ ) {
    videos[i] = new Vimeo.Player( iframes[i], options );
    videos[i].on('play',  bindValue(i, videos_flags));
}