JSFiddle - React, Tailwind, and code Playground

JavaScript

var x = "1";
switch (isNaN(x) || parseInt(x)) {
    case true:
      alert("IsNaN!") 
      break; 
    case 1: 
      alert("1"); 
      break; 
    case 2: 
      alert("2"); 
      break; 
    case 4: 
      alert("4"); 
      break; 
    default: 
      alert("default"); 
      break; 
}