JSFiddle - React, Tailwind, and code Playground

by gleezer

JavaScript

var var1,var2,var3;
    
   function good() {
     var var1 = 1, var2 = 1, var3 = 1;
   }

  function bad() {
    var var1 = var2 = var3 = 1;
  }

  good();
  alert(window.var2); // undefined

  bad();
  alert(window.var2); // still undefined.