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javascript coding interview questions

For breaking the string into key and value, you can use the split() method. These were originally designed for controlling fax machines, teletypes, and typewriters. Define and create a single object, with the keyword new . 40+ Top CSS Interview Questions and Answers, Download JavaScript Cheat Sheet PDF for Your Reference. Question: What are the various ways of embedding JavaScript code in an HTML file? Answer: There are three different ways of creating an array in JavaScript, namely: Answer: There are several possible ways of eliminating duplicates from a JS array. However, the most important difference between the two JS keywords is that while the var keyword is function scoped, the let keyword is block scoped. Answer: Java is a programming language, whereas JavaScript is essentially a scripting language. Answer: Closures provide a better, concise, creative, and expressive writing code for JavaScript developers and programmers. The if condition statement in the code evaluates using eval. JavaScript is the popular programming language of the web. Therefore, the following code snippet: All done! A set is an inbuilt object for storing unique values in an array. Here are the three main ways to do so: Hence, following a career path in JavaScript development is lucrative. Check that ultimate list of 25 advanced and tricky JavaScript Coding Interview Questions and Challenges to crack on your next senior web developer interview and got your next six-figure job offer in no time! Property- is the value assigned to the property like type=”text”, value=’Name’ etc. Using deferred scripts results in a delay in the script's execution when the HTML parser is running. operator. Consider checking out this excellent udemy course for preparing for an upcoming JS interview: JavaScript Interview Prep: Practice Problems. A function declaration, on the other hand, can be called before the same is defined. Question: In how many ways can you create an array in JS? Question: Write the code to force a page to load another page in JavaScript. 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. My name is Vijay Singh Khatri, and I enjoy meeting new people and finding ways to help them have an uplifting experience. Supporting object-oriented programming abilities, the JavaScript code can be inserted into HTML pages that can be understood and executed by web browsers. Question: Can you differentiate between let and var? Question: Please explain NEGATIVE_INFINITY in JavaScript. This isn’t the case for a function expression. Question: Could you explain escape() and unescape() functions? Whatever enclosed within the escape, characters get displayed by the JavaScript. As such, it has several traits of functional programming. This results in a delay in displaying the web page if the server is slow or the script that is to be loaded is bulky. Each one of them is briefly explained as follows: Answer: Functions that are automatically invoked are termed as Self Invoking Functions. The questions are further divided at a basic level and advanced level. Adding it between tags From an external file that is specified by the src attribute of a, There is no need for creating several objects for accessing NEGATIVE_INFINITY. It’s recommended to work with properties rather than attributes if the former is available. It is used for removing some code mistakes that result in dropped efficiency of JS engines. Question: Please explain the Strict mode in JavaScript. isArray() method checks whether the passed variable is an Array object. They can also be passed around as arguments to other functions or be returned from those functions. Password reset link will be sent to your email. Question: How can you import all exports of a file as an object in JavaScript? Give an example of demonstrating the difference between the two JS functions. Because arguments are to be passed in the .call() method, it is compulsory to know about the function's arguments. Question: Could you tell us about the various types of error constructors supported by JavaScript? This way of writing function expressions is preferred typically for non-method functions. Using Filter – It is possible to remove duplicates from an array in JavaScript by applying a filter to the same. Here is an excellent book with top Javascript programming questions and answers: JavaScript Interview Preparation: Practice Problems [Video]. In other words, a closure is a locally declared variable that is related to a function and stays in the memory when the related function has returned. To enable the Strict Mode, one needs to add the string literal “use strict” above the file that needs to be opened in the Strict Mode. Question: Difference between attributes and property? Question: What do you mean by Event Bubbling and Event Capturing? Question: How will you remove duplicates from a JS array? Some web browsers don’t let you delete a cookie unless you don’t specify the cookie's path. The following code snippet demonstrates using a normal function in JavaScript: The aforementioned function can be represented in a better way by using closures. Question: Can you draw a simple JavaScript DOM (Document Object Model)? Function expressions are typically restricted to be used when there is a need for a conditional declaration. 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.

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