JSFiddle - React, Tailwind, and code Playground

HTML

<button onclick="start()">Start Test</button>


<script>
    
    function test(num) {
        alert("running...");
        return num + 5;
    }
    
    function start(){
        alert(test(8));
        
        var func = new Function("num", "test(num)");
        alert(func(8)); 
    }
    
</script>