How to Answer JavaScript Interview Questions

Javascript interview questions can be tricky. It is better to be prepared than not be prepared. A good start is learning the language’s basics and syntax. For example, you need to know how to encode a string with balanced brackets, create a counter, and read and print an array.

 javascript url encode

Understanding how JavaScript works and hoisting is crucial in many JavaScript interview questions. For example, if you want to print the javascript url encode  two times, the first time will print “1”. If you publish the javascript url encode again, you will need to change the scope of the method print to a print method that prints “2” instead.

JavaScript is a popular scripting language widely used in web development and is a highly sought-after skill in the job market. To help you prepare for your JavaScript interview, we’ve compiled a list of the top JavaScript interview questions to help you practice. These questions are based on the main concepts of JavaScript and should give you a good idea of what to expect at a JavaScript interview.


BigInt is a data type used for comparisons. It is similar to a number but is not a direct equivalent. However, if a number is converted to BigInt, it will not provide extra precision. For example, a division of a BigInt will give an error.

In JavaScript, BigInt is a built-in object representing integers more significant than 253-1. It is formed by appending an n to the end of an integer literal. The function begins () returns a value of the BigInt data type.

The BigInt data type stores large integers as well as large fractions. Unlike Number, BigInt is always represented by adding “n” to the integer literal. BigInt also has an additional data type: undefined. This type is used when a variable is declared but not assigned a value. Another new data type is Symbol. ES6 has introduced this type, so ensure you’re familiar with it.


JavaScript, formerly known as Mocha, is an object-based scripting language used to create dynamic content for web applications. The language can be used on a website’s server side and the front end. Brendan Eich developed it. You can use it to add and remove elements from an array.

The language is widely used in web development and is a highly in-demand skill in the job market. To help you prepare for JavaScript interview questions, we’ve compiled a comprehensive list of 100 commonly asked questions. The questions cover the most common concepts and are designed to test your language knowledge. JavaScript allows you to insert code into an HTML document, making it interactive and engaging for users.


A Symbol object can be a powerful tool for developers. It can help them create hidden object properties that can’t be accidentally accessed. Things can also be made with a single Symbol and used to represent the same properties in multiple places. Symbols are also an excellent way to avoid bugs and property conflicts.

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