Boolean : Object

A true or false value.

Primitive:

true

Spec:

http://www.ecma-international.org/ecma-262/5.1/#sec-15.6

----

Boolean(value : Object) : Boolean

Coerces **value** into a boolean value. You can also use **!!value** to

do the coercion. Note **'false'** coerces to **true** since it is a non-empty

string. Use **value === 'true'** to convert a string to a Boolean.

<example>

console.log(Boolean(''));

console.log(Boolean('0'));

console.log(Boolean(0));

console.log(Boolean(1));

console.log(Boolean([]));

console.log(Boolean(undefined));

console.log(!!undefined);

console.log();

var stringToBoolean = function(value) {

return value === 'true';

};

console.log(Boolean('false'));

console.log(stringToBoolean('false'));

</example>

Spec:

http://www.ecma-international.org/ecma-262/5.1/#sec-15.6.1

----

new Boolean(value : Object) : Object

Creates a box for a boolean value.

<example>

var literal = true;

var boxed = new Boolean(true);

console.log(literal === true);

console.log(boxed === true);

console.log(boxed.valueOf() === true);

console.log();

// Literals cannot hold other properties but boxes can

literal.foo = 'bar';

boxed.foo = 'bar';

console.log(literal.foo);

console.log(boxed.foo);

</example>

Spec:

http://www.ecma-international.org/ecma-262/5.1/#sec-15.6.2

----

prototype.toString() : String

Returns a string representation of **this**.

<example>

console.log(true.toString());

console.log(false.toString());

</example>

Spec:

http://www.ecma-international.org/ecma-262/5.1/#sec-15.6.4.2