Question

The Boolean type has two literal
values: true and false.

Do not confuse the primitive Boolean
values true and false with the true
and false values of the Boolean
object. The Boolean object is a
wrapper around the primitive Boolean
data type. See Boolean Object for more
information.

What does this mean? What’s the difference between the Boolean object and the Boolean data type??

Answer 1

This is a boolean value:

true

This is a Boolean object wrapping the value:

new Boolean(true);

Having the object adds a level of indirection. Try this to see the difference:

var a = true;
var b = true;
var c = new Boolean(true);
var d = new Boolean(true);

alert(a == b); // true - two `true` values are equal.
alert(c == d); // false - they are not the same object.

See also:

• What is the purpose of new Boolean() in Javascript?