JSFiddle - React, Tailwind, and code Playground

HTML

<h1 id="title">BugBlog: JavaScript example zu && vs &</h1>
<input type="submit" id="byBtn" value="Change" onclick="change()"/>

JavaScript

function Hello(){
    
    alert("Hello");
    return FALSE;
}

function World(){
    
    alert("World");
    return FALSE;
}

function change(){

    alert("Mit einem & -> ");
    
    if(Hello() & World()){
        alert("!");    
    }else{
        alert("?");    
    }

    alert("Mit zwei & -> ");
    
    if(Hello() && World()){
        alert("!");    
    }else{
        alert("?");    
    }    
}