Constants in JavaScript

In addition to variables in JavaScript, you can also create constants. They can only be written to once, and then their values cannot be changed. Constants are declared using the operator const.

Typically, constants are used for values that should not be accidentally changed in code. For example, let's create the constant that will store the value of pi:

javascriptconst pi = 3.14;

Constants are usually written in capital letters so that they can be distinguished from regular variables:

javascriptconst PI = 3.14;

Let's try to change the value of our constant:

javascriptconst PI = 3.14;
PI = 3; // throws an error