JSFiddle - React, Tailwind, and code Playground

HTML

<input type="button" onClick="start();" value="Start"/>
<div id="box"></div>

JavaScript

function start() {
    var words = ['question', 'answer', 'guess', 'coach'];
    var randomWord = Math.floor(Math.random() * words.length);
    var splitWord = randomWord.split();
        for (var i = 0; i < splitWord.length; i++) {
            var randomLetter = Math.floor(Math.random() * splitWord.length);
            var index = splitWord.indexOf(randomLetter);
            alert(randomLetter + '<br />');
            splitWord.splice(index, 1)
        }
}