Introduction to JavaScript – Create a Variable: let
When you attempt to assign a value to a const variable like this example shows:
const myName = 'Seth'; myName = 'Hannah';
If you attempt the code above (assigning a value to a const variable) you will receive the following error:
TypeError: Assignment to constant variable.
JavaScript threw an error because you assigned a new value to a constant variable. Constant variables, as their name implies, are constant — you cannot assign them a different value.
Let variables, however, can be reassigned: (see code example below.)
let meal = 'Enchiladas'; console.log(meal); meal = 'Tacos'; console.log(meal); // output: Enchiladas // output: Tacos
In the example above, the let keyword is used to create the meal variable with the string ‘Enchiladas‘ saved to it. On code line three (above), the meal variable is changed to store the string ‘Tacos‘.
You may be wondering, when to use const vs let. In general, only use const if the value saved to a variable does not change in your program.
Introduction to JavaScript – Create a Variable: let
Related Videos:
Related Links:
My little pony learning game in VB.NET
See the JavaScript Glossary on Variables
W3Schools.com JavaScript Variables
Online JavaScript Compiler. Code on the go.
CSS, HTML, JAVASCRIPT, Online Compiler. Code on the go by replit.it
How to make a go-back button with PHP code?
Hello World Android app built with Android Studio
Introduction to JavaScript – Data Types
Introduction to JavaScript – Review Types and Operators
Introduction to JavaScript – Variables: String Interpolation
Why Python is the cooler programming language
Introduction to JavaScript – Variables: Undefined
Introduction to JavaScript – Properties
Introduction to JavaScript – Control Flow: if/else Statements
Who is this Android App Development course for?