Category: 04. JAVA SCRIPT

Reading a cookie using JavaScript is also very simple. We can use the document.cookie string that contains the cookies that we just created using that string. The document.cookie string keeps a list of name-value pairs separated by semicolons, where ‘name’ is the name of the cookie, and ‘value’ is its value. We can also use…

The simplest way of creating a cookie using JavaScript is as below:

Fig: Browser cookies A cookie is generally a small data that is sent from a website and stored on the user’s machine by a web browser that was used to access the website. Cookies are used to remember information for later use and also to record the browsing activity on a website.

There are primarily two ways of embedding JavaScript code:

Function declaration Function expression Declared as a separate statement within the main JavaScript code  Created inside an expression or some other construct Can be called before the function is defined Created when the execution point reaches it; can be used only after that Offers better code readability and better code organization Used when there is…

All modern web browsers like Chrome, Firefox, etc. have an inbuilt debugger that can be accessed anytime by pressing the relevant key, usually the F12 key. There are several features available to users in the debugging tools. We can also debug a JavaScript code inside a code editor that we use to develop a JavaScript…

In JavaScript, functions are objects and therefore, functions can take other functions as arguments and can also be returned by other functions. Fig: Callback function A callback is a JavaScript function that is passed to another function as an argument or a parameter. This function is to be executed whenever the function that it is passed to gets executed. 

Following are the naming conventions for a variable in JavaScript:

The ‘this’ keyword in JavaScript refers to the currently calling object. It is commonly used in constructors to assign values to object properties.

The scope of a variable implies where the variable has been declared or defined in a JavaScript program. There are two scopes of a variable: Global Scope Global variables, having global scope are available everywhere in a JavaScript code. Local Scope Local variables are accessible only within a function in which they are defined.