JavaScript Tutorial - Declaring variables [9 of 51]

JavaScript Tutorial - Declaring variables. Variables allow you to store pieces of information and are core to programming. How you declare variables in JavaScript has a large impact on how the variable will work and the changes you are (and aren't) allowed to make to it. We'll show you how to declare variables, and the best practices.

Variables allow you to store pieces of information and are core to programming. How you declare variables in JavaScript has a large impact on how the variable will work and the changes you are (and aren't) allowed to make to it. We'll show you how to declare variables, and the best practices.

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JavaScript values are allocated when things are created (objects, Strings, etc.) and freed automatically when they are no longer used. This process is called Garbage collection.

JavaScript spread operator is one of the more popular features that were introduced in ES6. This tutorial will help you understand it. You will learn what spread operator is and how it works. You will also learn how to use it to copy and merge arrays and object literals, insert data and more.