They are similar to properties but not as capable. The three most-used ones are described as follows: Answer: When in the Strict Mode, JS displays errors for some code segments that might be otherwise not available. Question: Can you differentiate between let and var? 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. Signup to submit and upvote tutorials, follow topics, and more. 40+ Top CSS Interview Questions and Answers, Download JavaScript Cheat Sheet PDF for Your Reference. Logging lines to console with `console. ads via Carbon. Try now. To call the filter() method, three arguments are required. Question: In how many ways can you create an array in JS? you have run your javascript file. The value of the NEGATIVE_INFINITY property is the same as the negative value of the global object's infinity property. How do you check if a value is in an array in JavaScript? These are Event Bubbling and Event Capturing. Such functions have no name, and thus the name. In other words, the Strict mode adds certain compulsions to the JS. Question: What do you understand by JavaScript? The following code snippet demonstrates using a normal function in JavaScript: The aforementioned function can be represented in a better way by using closures. You can work with functions as if they were objects. When a function is created inside an expression or another syntax construct, it is called a function expression. 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. A lightweight interpreted a programming language with some object-oriented capabilities. Properties are accessible by interacting with the object in Vanilla JS or using jQuery’s prop() method. 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: Difference between attributes and property? Hurray! Some web browsers don’t let you delete a cookie unless you don’t specify the cookie's path. As the value of the document. 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. A set is an inbuilt object for storing unique values in an array. The general syntax of using the for-in loop is: Answer: Both .call() and .apply() functions are almost identical in their use, with a major exception in how arguments are passed to the function. Question: Could you name some built-in methods in JavaScript? The general syntax of a Self Invoking Function is: Typically, a function is defined and then invoked. Question: Explain the use of debuggers in JavaScript? Consider checking out this excellent udemy course for preparing for an upcoming JS interview: JavaScript Interview Prep: Practice Problems. Answer: In JavaScript, we use escape characters, typically backslash (\ \) while working with special characters, such as ampersands (&), apostrophes (‘), double quotes (“ “), and single quotes (‘ ‘). come with an inbuilt debugger that can be summoned by pressing the F12 key. Old browsers treat this JS code as a long HTML comment. It is used for securely transferring information from one system to another over some network. You need to choose the Console tab to view the result. JavaScript is the popular programming language of the web. As such, it has several traits of functional programming. 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. 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. 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. Here is an excellent book with top Javascript programming questions and answers: JavaScript Interview Preparation: Practice Problems [Video]. It’s recommended to work with properties rather than attributes if the former is available. How do you create an object in JavaScript? The high-level, interpreted programming language follows a multi-paradigm approach. The Complete JavaScript Course 2020: Build Real Projects! Answer: A cookie is simply data, usually small, sent from a website and stored on the user’s computer by the web browser used to access the website. Answer: To import all exported members of an object, one can use: import * as object name from ‘./file.js.’. How will you create, read, and delete a cookie using JavaScript? tag. When to Use – Function declaration offers better readability and offers more freedom in organizing the code. The loop continues until all the object properties are exhausted. Define an object constructor, and then create objects of the constructed type. Question: Please write JavaScript code for adding new elements dynamically. The document.cookie string keeps a list of name = value pairs, where a semicolon separates each pair. Hence, this results in a reduction in the loading time of the webpage. 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.

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