Boolean object is an object wrapper for a boolean value.Boolean constructor:
new Boolean(value)
value |
Boolean object is used as the condition in a conditional test, JavaScript returns the value of the Boolean object. For example, a Boolean object whose value is false is treated as the primitive value false, and a Boolean object whose value is true is treated as the primitive value true in conditional tests. If the Boolean object is a false object, the conditional statement evaluates to false.
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watch and unwatch methods from Object.
Boolean objects with an initial value of false:
bNoParam = new Boolean()The following examples create
bZero = new Boolean(0)
bNull = new Boolean(null)
bEmptyString = new Boolean("")
bfalse = new Boolean(false)
Boolean objects with an initial value of true:
btrue = new Boolean(true)
btrueString = new Boolean("true")
bfalseString = new Boolean("false")
bSuLin = new Boolean("Su Lin")
Object.constructor.
Function.prototype.toString()
Boolean object overrides the toString method of the Object object; it does not inherit Object.toString. For Boolean objects, the toString method returns a string representation of the object.
JavaScript calls the toString method automatically when a Boolean is to be represented as a text value or when a Boolean is referred to in a string concatenation.
For Boolean objects and values, the built-in toString method returns the string "true" or "false" depending on the value of the boolean object. In the following code, flag.toString returns "true".
var flag = new Boolean(true)
var myVar=flag.toString()
Object.toString
valueOf()
valueOf method of Boolean returns the primitive value of a Boolean object or literal Boolean as a Boolean data type.
This method is usually called internally by JavaScript and not explicitly in code.
x = new Boolean();
myVar=x.valueOf() //assigns false to myVar
Object.valueOf
Last Updated: 11/13/98 10:22:49