Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

JavaScript JavaScript and the DOM (Retiring) Getting a Handle on the DOM A Simple Example

Posted by john knight
john knight
Courses Plus Student 9,155 Points

Question

What is the const keyword? and what it's the use of it?.

1 Answer

Steven Parker
Steven Parker
229,744 Points
Steven Parker
Steven Parker
229,744 Points

It is similar to "let", in that it creates a variable limited to the current scope. But a "const" variable can only be assigned at the same time it is created, and it's value cannot be changed later.

It is considered good practice to use const any time a variable will not be changed by the program during its lifetime. Examples:

let sample = 3;
const steady = 4;
sample = 7;  // this is OK
steady = 9;  // this causes an error
john knight
john knight
Courses Plus Student 9,155 Points

Thank you, Steven,