WebAug 16, 2010 · Undefined (type) is a built-in JavaScript type. undefined (value) is a primitive and is the sole value of the Undefined type. Any property that has not been assigned a value, assumes the undefined value. (ECMA 4.3.9 and 4.3.10). A function without a return statement, or a function with an empty return statement returns undefined. WebApr 13, 2024 · Answer — 25 25 undefined Explanation —While assign the key the object evaluates the numerical expression so it becomes person[.25e2] = person[25]. Thus while accessing when we use 25 and .25e2 it returns the value but for '.25e2' is undefined. Question 40: console.log(new Array(3).toString());

50 JavaScript Output-related Interview Questions

WebFeb 2, 2010 · If you leave console.log, console.info, etc messages in your JavaScript code and open the page in browser like IE then it may halt the page loading completely saying that ‘console not defined’ especially if your user uses a non IE8 browser. element: let text = myAnchor.getAttribute("target"); Try it Yourself ». how to spell shepherding

How to Check if a JavaScript Variable is Undefined

Webtypeof set to true will warn for variables used inside typeof check (Default false). typeof Examples of correct code for the default { "typeof": false } option: WebJan 19, 2024 · Example: Here we assign two variables one is undefined and the other one is defined as “null”, here null is not undefined when you put console.log it will show “null” if you check typeof then it will display the object, below program will illustrate the approach more clearly. javascript var firstName; var lastName = null; console.log (firstName); WebMost Recent Reports. August 2024, Hampshire County (Class B) - Hikers report Sasquatch stalking south of Amherst. September 2016, County (Class B) - Camper has an unnerving … how to spell shepherd or shepard