What is variable typing in javascript?
It is perfectly legal to assign a number to a variable and then assign a string to the same variable as follows example i = 10; i = “string”; This is called... Read more »
‘JavaScript Interview Questions’ - KyaPoocha.com
Does javascript have the concept level scope?
No.Javascript does not have block level scope,all the variables declared inside a function possess the same level of scope unlike c,c++,java. Read more »
What are undefined and undeclared variables?
Undeclared variables are those that are not declared in the program (do not exist at all),trying to read their values gives runtime error.But if undeclared variables... Read more »
What does the delete operator do?
The delete operator is used to delete all the variables and objects used in the program ,but it does not delete variables declared with var keyword. Read more »
What does break and continue statements do?
Continue statement continues the current loop (if label not specified) in a new iteration whereas break statement exits the current loop. Read more »
How to create a function using function constructor?
The following example illustrates this It creates a function called square with argument x and returns x multiplied by itself. var square = new Function (”x”,”return... Read more »
Where are cookies actually stored on the hard disk?
This depends on the user’s browser and OS. In the case of Netscape with Windows OS,all the cookies are stored in a single file called cookies.txt c:\Program Files\Netscape\Users\username\cookies.txt In... Read more »
How can JavaScript make a Web site easier to use? That is, are there certain JavaScript techniques that make it easier for people to use a Web site?
JavaScript’s greatest potential gift to a Web site is that scripts can make the page more immediately interactive, that is, interactive without having to submit... Read more »
How can JavaScript be used to personalize or tailor a Web site to fit individual users?
JavaScript allows a Web page to perform “if-then” kinds of decisions based on browser version, operating system, user input, and, in more recent browsers, details... Read more »
What about this Ecmascript? Is it just a version of Javascript?
It’s more like the other way around: JavaScript is a version of ECMAScript.You have to remember that, technically, JavaScript only refers to the language in Netscape/Mozilla... Read more »
What is the future of JavaScript?
The core language is filling out nicely with the versions implemented in Navigator 4 and Internet Explorer 4. There will certainly be some additions to the core... Read more »
What is the difference between error and an exception?
An error is an irrecoverable condition occurring at runtime. Such as OutOfMemory error. These JVM errors and you can not repair them at runtime. While exceptions... Read more »
What are JavaScript data types?
Number, String, Boolean, Function, Object, Null, Undefined. Read more »
How do you convert numbers between different bases in JavaScript?
Use the parseInt() function, that takes a string as the first parameter, and the base as a second parameter. So to convert hexadecimal 3F to decimal, use parseInt... Read more »
What does isNaN function do?
Return true if the argument is not a number. Read more »
What is negative infinity?
It’s a number in JavaScript, derived by dividing negative number by zero. Read more »
What does “1?+3+6 evaluate to and also what about 2+5+”6??
Since 1 is a string, everything is a string, so the result is 136 and in the second part : 2 and 5 are integers, this is number arithmetic, since 6 is a string,... Read more »
What’s relationship between JavaScript and ECMAScript?
ECMAScript is yet another name for JavaScript (other names include LiveScript). The current JavaScript that you see supported in browsers is ECMAScript revision... Read more »
How can I call a Java method from Javascript?
Direct Web Remoting is an open source Java library which allows for easy integration of AJAX into your web site. It allows you to call Java methods directly from... Read more »
How do you get the value of a combo box in Javascript?
To get value of Combo Box use document.form_name.element_name.value Read more »