Boolean

var x = new Boolean(false);
if (x) {
  //   
}

var x = false;
if (x) {
  //    
}

var x = Boolean(expression); // 
var x = new Boolean(expression); //  

var myFalse = new Boolean(false); //  
var g = Boolean(myFalse); //  
var myString = new String("Hello"); //  
var s = Boolean(myString); //  

var bNoParam = new Boolean();
var bZero = new Boolean(0);
var bNull = new Boolean(null);
var bEmptyString = new Boolean("");
var bfalse = new Boolean(false);

var btrue = new Boolean(true);
var btrueString = new Boolean("true");
var bfalseString = new Boolean("false");
var bSuLin = new Boolean("Su Lin");
var bArrayProto = new Boolean([]);
var bObjProto = new Boolean({});