Declaring a Constant Variable
The const keyword in JavaScript is primarily used for declaring constants. The value of a const variable cannot be reassigned after initialization.
Example: This example shows the declaration of some constant by using the const keyword.
const PI = 3.14159;
console.log(PI); // Output: 3.14159
// Attempting to reassign the value of a
// const variable will result in an error
// PI = 3.14; // Error: Assignment to constant variable.
Output
3.14159
What does Const Do in JavaScript ?
In JavaScript, const is a keyword used to declare constants. Once assigned, the value of a constant cannot be changed. It provides a way to create read-only variables. Attempting to reassign a const variable will result in a syntax error.
These are the following ways to use const:
Table of Content
- Declaring a Constant Variable
- Using const with Object Literal
- Using const with Arrays