In JavaScript, almost everything is an object. Objects are used to store information in key-value pairs, where the value can be any other data type or function. Unlike arrays and strings, objects do not have a predefined property that returns their length. Therefore, if you try to get the value of an object’s length property,…
Hi! For example, you need to know if a function exists in order to execute it.To check for the existence of a js function, you can do so in a simple way: It’s all very simple. That’s how you check if a JavaScript function exists.
A date is given and the task is to subtract days from the date. To subtract days from a date in JavaScript, you use some of the methods described below: JavaScript getDate () Method: This method returns the day of the month (from 1 to 31) for a specific date. Syntax: Returned value: returns a…
I have some JavaScript code that works in FireFox, but not in Chrome or IE. In Chrome JS console I get the following error: Msgstr “Uncaught SyntaxError: Unexpected end of input”. The JavaScript code I’m using: This indicates an error in the last line, which is }); Solution Add a second });. With the correct…
Definition and application The JavaScript baseURI property of the Node object returns a string ( DOMString ) representing the absolute base URL of the node. The property is read-only. Please note that the value of the property may be null , in the event that it is not possible to obtain an absolute URL ,…
Problem This may seem like a recurring question, but none of the solutions seem to work for me. I have gem jquery-railsin my Gemfile. Also the lines And this is my Gemfile: My application.html.erb: I can’t start my Rails application. I do not understand what the problem is. My ruby version is 2.1.6 Please help. Solutions 1 I ‘m following couldn’t find file…
How do I swap two elements in an array in JavaScript? Suppose we have an array that contains 5 letters. We want to swap the element with index 4 (in this case “d”) with the element with index 3 (in this case “e”). We can use a temporary itemtmp to keep the value of #…
Study, practice, then rest. If you’re intent on mastering the fundamentals of JavaScript,as opposed to just getting a feel for the language, work with this book and the online exercises in a 15-to-30-minute session, then take a break. Study a chapter for 5 to 10 minutes. Immediately go online at http://www.ASmarterWayToLearn.com/js and code for 10…
My more or less serious way in programming started with writing programs in C#, sometimes I tried to write in JavaScript, and now and then I got stumped in such situations, when I had incorrectly specified variable name and found out about it many years later after many hours of debugging, because I did not…
Not so long ago we were developing a clock using javascript. Today we want to take it a step further and tell you how to implement the alarm clock feature in our clock using the HTML5 tag audio. We’ll need to add the following functionality: provide the ability to set and edit the alarm clock,…