JavaScript const statement

constto declare a read-only named constant.

Constants are block-scoped, very similar to usingletVariables defined by statements.

The value of a constant cannot be changed by reassignment and cannot be declared again.

You can find ourJavaScript Scope TutorialLearn more about variable scope.

Syntax:

const identifier = value;

Example

const MY_AGE =　120;

The numbers in the table specify the first browser version that fully supports const statements:

Statement
const	21	36	is	5.1	11

Parameter	Description
identifier	Specify the name of the constant. It can be any legal identifier. Constant names can contain letters, numbers, underscores, and dollar signs. Constant names must start with a letter Constant names can also start with $ and _ Constant names are case-sensitive (city and City are different constants) Reserved words cannot be used as constant names
value	The value of constants. It can be any legal expression.

JavaScript Version:	ECMAScript 1

JavaScript Tutorial:JavaScript Scope