Javascript Boolean constructor

Introduction

The Boolean() constructor can create Boolean objects. 

new Boolean([value])
  • value - Optional, the initial value of the Boolean object.
var myFalse = new Boolean(false);   // initial value of false
var g = Boolean(myFalse);           // initial value of true
var myString = new String('Hello'); // string object
var s = Boolean(myString);          // initial value of true

let a = new Boolean("true");
console.log(a);/*from   ww w.  j av  a  2  s.  c o  m*/

a = new Boolean("1");
console.log(a);

a = new Boolean("false");
console.log(a);

a = new Boolean({});
console.log(a);

a = new Boolean(true);
console.log(a);

a = new Boolean(false);
console.log(a);

Creating Boolean objects with an initial value of false 

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

Creating Boolean objects with an initial value of true 

var btrue = new Boolean(true);
var btrueString = new Boolean('true');
var bfalseString = new Boolean('false');
var bSuLin = new Boolean('asdf');
var bArrayProto = new Boolean([]);
var bObjProto = new Boolean({});

Do not use a Boolean object in place of a Boolean primitive.




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