Tag: variables

Learn how to check if a variable is set in PHP, what its values are, and the differences between the isset, is_null, and empty methods.

How does JavaScript's scoping system work? Learn the difference between local scope and global scope, and what hoisting is.

Aurelio introduces let and const, two new ES6 keywords for defining variables, showing examples of how they work and how they differ from the var keyword.

Naveen Karippai takes a close look at how JavaScript references work, how they differ from primitive values, and shows how to avoid some common gotchas.

Get a solid understanding of the language from first principles, as Tania Rascia explains the basics of JavaScript variables and datatypes.

Julian Motz examines how variables are declared in JavaScript, and introduces the three different types of declaration and their uses.

Jeff Mott helps you truly master the concept of closures in JavaScript using simple examples, demonstrating how they would be implemented from scratch.

Kyle Pennell explains why the two new ES6 variable keywords, const and let, are helpful in giving block scoping.

Variables allow you to use data over and over again throughout your CSS files. In this video I'll teach you about how to use variables in your projects.

Craig takes a look at native CSS variables, which can now be used in Firefox 31. Has the technology become redundant before we can use it?

Read Coming Soon: Native CSS Variables and learn with SitePoint. Our web development and design tutorials, courses, and books will teach you HTML, CSS, JavaScript, PHP, Python, and more.

Read PHPMaster: Variables in PHP and learn with SitePoint. Our web development and design tutorials, courses, and books will teach you HTML, CSS, JavaScript, PHP, Python, and more.