JSFiddle - React, Tailwind, and code Playground

by George Yong

JavaScript

var g = 5;
alert(g); //alerts 5

function haha() {
    alert(g); // alerts NOTHING. Why is this? Why not alert 5?
    var g = 45;
    alert(g); // alerts 45
};

haha();
alert(g); // alerts 5. Because g = 45 is a local variable.