Before C++11 the auto keyword was used for storage duration specification. In the new standard its purpose was changed towards type inference. auto is now a sort of placeholder for a type, telling the compiler it has to deduce the actual type of a variable that is being declared from its initializer. It can be […]
Closures allow JavaScript programmers to write better code. Creative, expressive, and concise. We frequently use closures in JavaScript, and, no matter your JavaScript experience, you will undoubtedly encounter them time and again. Sure, closures might appear complex and beyond your scope, but after you read this article, closures will be much more easily understood and […]
n this post, we will learn JavaScript’s variable scope and hoisting and all the idiosyncrasies of both. We must understand how variable scope and variable hoisting work in JavaScript, if want to understand JavaScript well. These concepts may seem straightforward; they are not. Some important subtleties exist that we must understand, if we want to […]
JavaScript Prototype in Plain Language jan. 25 2013 147 Prototype is a fundamental concept that every JavaScript developer must understand, and this article aims to explain JavaScript’s prototype in plain, detailed language. If you don’t understand JavaScript’s prototype after reading this blog post, please ask questions in the comments below. I will personally answer all […]
JavaScript’s core—most often used and most fundamental—data type is the Object data type. JavaScript has one complex data type, the Object data type, and it has five simple data types: Number, String, Boolean, Undefined, and Null. Note that these simple (primitive) data types are immutable (cannot be changed), while objects are mutable (can be changed). […]
Closures allow JavaScript programmers to write better code. Creative, expressive, and concise. We frequently use closures in JavaScript, and, no matter your JavaScript experience, you will undoubtedly encounter them time and again. Sure, closures might appear complex and beyond your scope, but after you read this article, closures will be much more easily understood and […]
Moving on, every web page written in HTML shares a common structure, an example of which is below: <!DOCTYPE html> <html> <head> <title>A Web Page</title> </head> <body> <h1>A Web Page</h1> </body> </html> <!DOCTYPE html> is the first and most important line of an HTML document. It ensures that web browsers will correctly read the HTML […]
First of all we must make the html form for index.html: <html> <body> <form action=”index.php” method=”get”> <input type=”text” name=”user”> <input type=”submit” value=”post”> </form> </body> </html> This html script will post form data to index.php, for example we write “Mikel” on the box and clock post button, the url will change to index.php?user=mikel Now the php […]
When you’re managing a blog or a website, knowing the basics of HTML, CSS or even Javascript can be a crucial skill to have. Even if you don’t plan on building your own site from the ground up, common things like creating linked images, or creating stylized text, are important to know.When you’re managing a […]
SQL CHECK Constraint The CHECK constraint is used to limit the value range that can be placed in a column. If you define a CHECK constraint on a single column it allows only certain values for this column. If you define a CHECK constraint on a table it can limit the values in certain columns […]