The object may contain two boolean values, true and false. In addition there is the JavaScript keywords true and false, which can be compared to the result of a conditional expression. They are semantically different things even though they have the same effects in operations.
A Boolean object may be created with the following syntax:
var b = new Boolean(value) The value being either 1 or true, or 0 or false.
Some examples of use of boolean numbers, with results displayed in the page, under the code...
var a = new Boolean(1);
document.write(a);
var a = new Boolean(0);
document.write(a); Any number different of 0 is true.
var a = new Boolean(5);
document.write(a); A string is true.
var a = new Boolean("text");
document.write(a); Even if it is empty...
var a = new Boolean("");
document.write(a); The true keyword has the boolean value true.
var a = new Boolean(true);
document.write(a); The false keyword has the boolean value false.
var a = new Boolean(false);
document.write(a);
JavaScript also says false the values of following keywords:
- null
- NaN
- undefined.