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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??

DarkLightA
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4 Answers4

3

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:

Community
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Mark Byers
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  • Thanks for the answer, but I still don't understand when you'd want to use one rather than the other. – DarkLightA Dec 25 '10 at 22:19
  • @DarkLightA: I suggest you look at this question: http://stackoverflow.com/questions/856324/what-is-the-purpose-of-javascript-new-boolean – Mark Byers Dec 25 '10 at 22:22
2

I want to add to other answers that a Boolean object can also be null, but a boolean value cannot.

Alexandre Lagane
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0

The boolean data type is a value that can only be true or false. The Boolean object is an object that represents a boolean value.

Jeff Hubbard
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0

The Boolean Data Type is the 'boolean' (TRUE or FALSE) whereas the Boolean Object is an object that translates values INTO boolean data

You'll find an explanation here

w3schools

NightOwlPrgmr
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Mantar
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