What is unshift method in JavaScript? When the event queue runs its timed-out event, the next item is processed and a timer is set to again invoke nextListItem. When used the typeof operator on null; i.e., typeof(null), the value is an object. The function .call() and .apply() are very similar in their usage except a little difference. While this seems straightforward enough, there are a couple of somewhat surprising characteristics of NaN that can result in hair-pulling bugs if one is not aware of them. Both are almost similar. With over a decade of programming experience and 6+ years as a business owner, Lorand knows the importance of great communication and understanding with a client. Place backslash before the characters to make it display. Is it possible to break JavaScript Code into several lines? Removing Elements From An Array In JavaScript. Appending approaches cannot be used and this is another drawback. Write the code for adding new elements dynamically? Using this method, we can append multiple elements by passing multiple arguments. Interviews on Javascript are mostly done in 2-3 phases; but again, it depends on the company. This could be details of the username and the information related to what they are interested in. (iii) getElementsByTagName('tagname'): Gets all the elements that have the given tag name. Explanation: Although the first "1" operand is typecast to a numeric value based on the unary + operator that precedes it, it is then immediately converted back to a string when it is concatenated with the second "1" operand, which is then concatenated with the final "2" operand, yielding the string "112". "==" checks only for equality in value whereas "===" is a stricter equality test and returns false if either the value or the type of the two variables are different. A prompt box is often used if you want the user to input a value before entering a page. It is really helpful to increase my knowledge. The 'Navigator.appversion' is used to find the name of the operating system in the client machine. The scope of a variable is the region of your program in which it is defined. What is the difference between ViewState and SessionState? The push method is used to add or append one or more elements to the end of an Array. When a string or something else is being converted into a number and that cannot be done, then we get to see NaN.     console.log('in iffe'); Are you familiar with the concept of negative infinity in the JavaScript?Yes, it is actually a number present in this language and can simply be derived by dividing any number having negative value with zero. Just like push() which inserts elements into an array at the end of it, the unshift() function inserts elements at the beginning of an array. 42) What is an Event Bubbling in Javascript? In a program, how can you delete the variables? Old browsers will now treat this JavaScript code as a long HTML comment. But running this code marks those properties as “own properties” of the object. Download & Edit, Get Noticed by Top Employers. It’s because JavaScript initialization is not hoisted. Since 3 and 2 are integers, they will be added numerically. Is it possible in JavaScript to proceed with automatic type conversation?Yes, it’s possible and there is nothing much programmers have to do to access it. Note that, in strict mode (i.e., with use strict), the statement var a = b = 3; will generate a runtime error of ReferenceError: b is not defined, thereby avoiding any headfakes/bugs that might othewise result.