Quick Tip: How To Check if a Variable Is Set in PHP
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.
Tag: variables
Demystifying JavaScript Variable Scope and Hoisting
How does JavaScript's scoping system work? Learn the difference between local scope and global scope, and what hoisting is.
ES6 in Action: let and const
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.
Quick Tip: How JavaScript References Work
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.
A Beginner’s Guide to JavaScript Variables and Datatypes
Get a solid understanding of the language from first principles, as Tania Rascia explains the basics of JavaScript variables and datatypes.
Quick Tip: How to Declare Variables in JavaScript
Julian Motz examines how variables are declared in JavaScript, and introduces the three different types of declaration and their uses.
The Joys of Block Scoping with ES6
Kyle Pennell explains why the two new ES6 variable keywords, const and let, are helpful in giving block scoping.