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Javascript null mean?

Posted By :Jack Smith     Posted Date :November 05, 2012    Points :40   Category :JavaScript/VBScript 
The null value is a unique value representing no value or no object.
It implies no object,or null string,no valid boolean value,no number and no array object.

You can also find related Interview Question to Javascript null mean?  below: 

What does javascript null mean?

The null value is a unique value representing no value or no object.
It implies no object,or null string,no valid boolean value,no number and no array object. (More...)

What is the difference between NULL AND VOID pointer?

NULL can be value for pointer type variables.
VOID is a type identifier which has not size.
NULL and void are not same. Example: void* ptr = NULL; (More...)

What is a Null object?

It is an object of some class whose purpose is to indicate that a real object of that class does not exist. One common use for a null object is a return value from a member function that is supposed to return an object with some specified properties but cannot find such an object. (More...)

Name the DatTypes of JavaScript?

4)Null (More...)

Can you control concatenation of string values with null values?

Concatenation of string values with null values results either null value or string value.
We can control that by setting CONCAT_NULL_YIELDS_NULL on or off.
When it is set to ON, the concatenation will result null and when it is set to OFF, it will result the string.
Setting it ON,
print 'testing' + NULL; --results NULL and prints nothing

Setting it OFF,

print 'testing' + NULL; -- results testing and prints the same (More...)

What is NOT NULL Constraint?

A NOT NULL Constraint enforces that the column will not accept NULL values.The NOT NULL constraint are used to enforce domain integrity as the check constraint. (More...)

Whether Javascript is a OOP's based language?

No. It doesn't support all the concepts of OOPS. It supports partially. (More...)

Whether VBscript or Javascript which is better?

Javascript. Since it is platform independent. (More...)

How do you Implement Timer Control in Javascript?

set Timedout("alert('5 seconds')",5000); Here the argument 5000 shows the millisecond value. (More...)

How do you declare 2 dimensional array in Javascript?

myarray[0][0]="Compaq 486"
myarray[0][1]="Compaq 586"
myarray[0][2]="Compaq 686"
myarray[1][0]="Dell 486"
myarray[1][1]="Dell 586"
myarray[1][2]="Dell 686"
myarray[2][0]="IBM 486"
myarray[2][1]="IBM 586"
myarray[2][2]="IBM 686" (More...)

How to validate a Email-address, in Form using JavaScript?

We can validate it through the reg expressions. For example we can declare all the reg expressions of the email in a variable as follows.

var reg = /^([A-Za-z0-9_-.])+@([A-Za-z0-9_-.])+.([A-Za-z]{2,4})$/; We need to compare the actual value with this expression for the validation. (More...)

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