In this post we will discuss that How to Declare Variable in JavaScript. What are the variables in javascript or use of variable in javascript. In JavaScript, you can declare a variable using one of three keywords: var, let, or const. Here are some examples of how to declare a variable using each of these […]

Reducing unused JavaScript is an important optimization technique to improve the performance of a website or application. Optimeze Javascript File Here are some tips to reduce unused JavaScript: Use a build tool: Use a build tool like webpack or gulp to bundle and minify your JavaScript files. This will help to reduce the size of […]

In this article we will discuss What is the purpose of using the try-catch block in JavaScript? The ‘try-catch’ block is used in JavaScript for error handling. It allows you to write code that can gracefully handle errors, and it prevents your program from crashing when an error occurs. The ‘try-catch’ block works by enclosing […]

In this article you will know that What is a callback function in JavaScript? Using a callback function is with the ‘setTimeout()’ function. The ‘setTimeout()’ function takes two arguments: a function to execute, and a time delay in milliseconds. The function that is passed as the first argument is executed after the specified delay has […]

In this article we will see Difference between sync and async code execution In JavaScript, synchronous code is executed sequentially, one line of code at a time. Each line of code must be completed before moving on to the next line. Asynchronous code, on the other hand, allows multiple tasks to be executed simultaneously. Asynchronous […]

In this article we will see What is the use of the “this” keyword in JavaScript? In JavaScript, the ‘this’ keyword is a reference to the object that owns the code that is currently being executed. It allows you to refer to properties and methods of the current object within its scope. The value of […]

In this article we are going to show you Difference between let and const and var in JavaScript. In JavaScript, let, const, and var are used to declare variables. The main differences between them are as follows: 1.var var was the original way to declare a variable in JavaScript. Variables declared with var are function-scoped, […]

In JavaScript, == (equality) and === (strict equality) are used to compare values or expressions. The main difference between them is how they compare the values. The == (equality) operator compares the values for equality after performing type coercion if necessary. This means that if the types of the operands are different, JavaScript will attempt […]

In this article we are going to show you Difference between undefined and null in JavaScript? In JavaScript, both undefined and null represent an absence of value, but they are not the same thing. undefined means that a variable has been declared but has not been assigned a value yet. It is also the default […]

In this post we will discuss What are the data types supported by JavaScript? The data types supported by JavaScript are: Undefined Null Boolean String Symbol Number Object