Which one of the following keywords is used for defining the function in the JavaScript void init main function?

Explanation: Void functions does not return a value. Functions with no return value are sometimes called procedures. … Explanation: A JavaScript function is defined with the function keyword, followed by a name, followed by parentheses().

What is the this keyword in JavaScript?

The JavaScript this keyword refers to the object it belongs to. … Alone, this refers to the global object. In a function, this refers to the global object. In a function, in strict mode, this is undefined . In an event, this refers to the element that received the event.

Which type of JavaScript language is ___?

Reason: JavaScript is not a pure OOP’s (object oriented programming) based languages such as PHP, java or many other languages, although it is an object-based language.

Which is the keyword used to create an object in JavaScript?

New keyword in JavaScript is used to create an instance of an object that has a constructor function.

What is == and === in JavaScript?

= is used for assigning values to a variable in JavaScript. == is used for comparison between two variables irrespective of the datatype of variable. === is used for comparision between two variables but this will check strict type, which means it will check datatype and compare two values.

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What is JavaScript and its types?

JavaScript has six primitives types: string , number , undefined , null , boolean , and symbol . There is also a compound type or object . Interestingly, the primitive types are immutable and don’t have properties. … The types in JavaScript look simple and useless but knowing how they work is important.

Why is JavaScript used?

JavaScript is commonly used for creating web pages. It allows us to add dynamic behavior to the webpage and add special effects to the webpage. On websites, it is mainly used for validation purposes. JavaScript helps us to execute complex actions and also enables the interaction of websites with visitors.

What are the disadvantages of JavaScript?

Disadvantages of JavaScript

  • Client-side Security. Since the JavaScript code is viewable to the user, others may use it for malicious purposes. …
  • Browser Support. The browser interprets JavaScript differently in different browsers. …
  • Lack of Debugging Facility. …
  • Single Inheritance. …
  • Sluggish Bitwise Function. …
  • Rendering Stopped.

What is the original name of JavaScript?

When Eich created JavaScript in 1995, he created it for Netscape Navigator and it quickly became known as LiveScript. In another quirk of JavaScript history, the team changed the name to JavaScript to reflect Netscape’s support of Java within its browser.

What is JSON language?

JSON is a lightweight, text-based, language-independent data interchange format. It was derived from the Javascript/ECMAScript programming language, but is programming language independent. … JSON provides simple notation for expressing objects, collections of name/value pairs, and for arrays, ordered lists of values.

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What is new student () in JavaScript?

It makes the this variable point to the newly created object. It executes the constructor function, using the newly created object whenever this is mentioned. It returns the newly created object, unless the constructor function returns a non- null object reference.

What is object in HTML?

Definition and Usage

The <object> tag defines a container for an external resource. The external resource can be a web page, a picture, a media player, or a plug-in application. To embed a picture, it is better to use the <img> tag.

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