JSFiddle - React, Tailwind, and code Playground
HTML
<p>Click the button to join the array elements into a string.</p>
<button onclick="decodeMorse(' aa a aaaa sd ')">Try it</button>
<p id="demo"></p>
<script>
function decodeMorse(morseCode){
document.querySelector("p").innerHTML = morseCode.trim().split(/ | /).map( (code) => code || 'z').join(' ');
}
</script>