What are three types of objects supported by JavaScript?

Which of the following type is supported by JavaScript?

JavaScript primitive data types

Data Type Description
String represents sequence of characters e.g. “hello”
Number represents numeric values e.g. 100
Boolean represents boolean value either false or true
Undefined represents undefined value

What are the basic model objects supported in JavaScript?

Some important JavaScript objects

  • The ‘global’ object. When the JavaScript interpreter starts up, there is always a single global object instance created. …
  • The Window object for client-side JavaScript: window. …
  • The Document object: document. …
  • The ‘call’ object. …
  • String objects. …
  • Array objects. …
  • Function objects. …
  • Math objects.

How many types create objects in JavaScript?

There are four ways to create an object in JavaScript – using object literals, using the function constructor, using the Object. create method, and using the class keyword (which is almost the same as using a function constructor).

What is JSON format?

JavaScript Object Notation (JSON) is a standard text-based format for representing structured data based on JavaScript object syntax. It is commonly used for transmitting data in web applications (e.g., sending some data from the server to the client, so it can be displayed on a web page, or vice versa).

THIS MEANING:  Best answer: How do I drop a stored procedure in SQL Server?

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.

What is the main use of JavaScript?

JavaScript is a text-based programming language used both on the client-side and server-side that allows you to make web pages interactive. Where HTML and CSS are languages that give structure and style to web pages, JavaScript gives web pages interactive elements that engage a user.

What are advantages of JavaScript?

Advantages of JavaScript

  • Speed. Client-side JavaScript is very fast because it can be run immediately within the client-side browser. …
  • Simplicity. JavaScript is relatively simple to learn and implement.
  • Popularity. …
  • Interoperability. …
  • Server Load. …
  • Gives the ability to create rich interfaces.

Is JavaScript class based?

JavaScript is an object-based language based on prototypes, rather than being class-based. Because of this different basis, it can be less apparent how JavaScript allows you to create hierarchies of objects and to have inheritance of properties and their values.

What is object in HTML?

The <object> HTML element represents an external resource, which can be treated as an image, a nested browsing context, or a resource to be handled by a plugin.

What is closure give an example?

A closure is the combination of a function bundled together (enclosed) with references to its surrounding state (the lexical environment). In other words, a closure gives you access to an outer function’s scope from an inner function.

THIS MEANING:  Does MySQL have a REST API?

Is used to create an object?

A class may define an object. … Explanation: The values assigned by the constructor to the class members is used to create the object.