JSFiddle - React, Tailwind, and code Playground

HTML

<div id="log"></div>

JavaScript

(function(){
  var onPlayerReady = []
  for (var i = 0; i < 5; i++) {
    onPlayerReady[i] = "onPlayerReady"+i
    let funcBody = 'document.querySelector(\'#log\').innerHTML +="test '+i+'<br>"'
    window[onPlayerReady[i]] = new Function('', funcBody)
  }
})()


onPlayerReady0()
onPlayerReady3()