JavaScript Interview Questions

1. JavaScript Interview Questions

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5. Q. What is JavaScript? • JavaScript is a lightweight, interpreted programming language with object-oriented capabilities that allows you to build interactivity into otherwise static HTML pages. The general-purpose core of the language has been embedded in Netscape, Internet Explorer, and other web browsers

6. Q. JavaScript Vs Jscript? • JavaScript and Jscript are almost similar, whereas JavaScript was developed by Netscape. Microsoft reverse engineered Javascript and called it JScript.

7. Q. How to create a class? • JavaScript does not have a class definition. To mimic classes in JavaScript functions can be used to declare a class.Example:Let’s create a student class in JavaScript which takes two parameters name and roll as property. The code will look like below, • Function Student (name .roll){this.name = name;this.roll = roll;}

8. Q. What is callback?  • A callback is a plain JavaScript function passed to some method as an argument or option. Some callbacks are just events, called to give the user a chance to react when a certain state is triggered.

9. Q. How to create an object? • An object in JavaScript can be created using two was:New Key word:To create a student object from the above student class we can call the Student function using new keyword.var student1 = new Student(‘santosh’,2)Anonymous Object:Anonymous objects can be created using pair of curls’ braces containing property name and value pairs.Var rose = {‘color’: ‘red’}

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