Intermediate Level JavaScript Interview Questions Q22. These are namely array, current element, and index of the current element.function unque_array (arr){, By using the For loop – In this method of removing duplicate elements from an array, an empty array is used for storing all the repeating, By using Set – This is the simplest approach of removing duplicate elements from an array in JS. Reference Error – It comes into play when an undeclared variable is used. Using Filter – It is possible to remove duplicates from an array in JavaScript by applying a filter to the same. Each one of them is briefly explained as follows: Answer: Functions that are automatically invoked are termed as Self Invoking Functions. Question: Please explain the various JavaScript data types? You need to choose the Console tab to view the result. An open, cross-platform scripting language, Designed especially for creating network-centric applications, Range Error – Generated when a number outside the specified range is used. Question: In how many ways can you create an array in JS? Give an example of demonstrating the difference between the two JS functions. Hence, this results in a reduction in the loading time of the webpage. Because of this different basis, it can be less apparent how JavaScript allows you to create hierarchies of objects and to have the inheritance of properties and their values. Question: What role do deferred scripts play in JavaScript? Property- is the value assigned to the property like type=”text”, value=’Name’ etc. Question: Please explain Self Invoking Function and its syntax. The high-level, interpreted programming language follows a multi-paradigm approach. Another important distinction between Java and JS code is that while the former requires compilation, the latter is available in a text format. A function declaration, on the other hand, can be called before the same is defined. Answer: Following are the differences between function declaration and function expression: Answer: JS DOM objects have properties that are like instance variables for particular elements. operator. I have had a variety of customer service opportunities, through which I was able to have fewer returned products and increased repeat customers, when compared with co-workers. The function expression is usable only from that moment onwards. Question: What do you understand by Screen objects? Question: Is there any short and concise way of writing function expressions in JS? The global isNaN() function converts the tested value to a Number, then tests it. How do you check if a value is in an array in JavaScript? The closure contains all local variables that were in-scope at the time of the closure creation. The following code snippet demonstrates using a normal function in JavaScript: The aforementioned function can be represented in a better way by using closures. This is demonstrated in the following code snippet: Answer: The NEGATIVE_INFINITY is a static property in JS that results when a negative number is divided by 0. Question: Please describe the most important advantages of using JavaScript? This isn’t the case for a function expression. Pausing code execution with the `debugger` ... Didn’t recieve the password reset link? Question: Could you enumerate the various features of JavaScript? Give its syntax. The general syntax of a Self Invoking Function is: Typically, a function is defined and then invoked. In JavaScript, functions are objects. A set is an inbuilt object for storing unique values in an array. Nonetheless, standalone desktop applications can be built with JavaScript by using Electron and Node.js. As the value of the document. 40+ Top CSS Interview Questions and Answers, Download JavaScript Cheat Sheet PDF for Your Reference. If you take a look at the StackOverflow Developer Survey 2019, you will find that JavaScript tops the list of the most preferred programming language for the 6th consecutive year. Question: Please explain the Strict mode in JavaScript. Question: Explain the difference between function declaration and function expression? Question: Could you name some built-in methods in JavaScript? Whatever enclosed within the escape, characters get displayed by the JavaScript. There are different ways to create new objects: Define and create a single object, using an object literal. Please explain. Question: What do you understand by cookies? Object constructor: In JavaScript, there is a special constructor function known as Object() is used to create and initialize an object. Properties are accessible by interacting with the object in Vanilla JS or using jQuery’s prop() method. URI Error – Generated due to the use of illegal characters. Top JavaScript Interview Questions and Answers. It is used for removing some code mistakes that result in dropped efficiency of JS engines. Now let’s move on to the next section of JavaScript interview questions. Each one of them is briefed up as follows: Answer: Some important features of JavaScript are: Answer: Both let and var are used for variable and method declaration in JavaScript. It is a reliable way for websites to remember stateful information and record the user's browsing activity.