Jul 8, 2025 · The const declaration declares block-scoped local variables. The value of a constant can't be changed through reassignment using the assignment operator, but if a constant is an …

Declaring a variable with const is similar to let when it comes to Block Scope. The x declared in the block, in this example, is not the same as the x declared outside the block:

In some programming languages, const is a type qualifier (a keyword applied to a data type) that indicates that the data is read-only.

Jul 11, 2025 · The const keyword in JavaScript is a modern way to declare variables, introduced in (ES6). It is used to declare variables whose values need to remain constant throughout the …

The const keyword in JavaScript is used for declaring variables that you don’t want to be reassigned. It is a best practice to use const for variables that should not change to make your …

21.1 const Variables and Fields You can mark a variable as “constant” by writing const in front of the declaration. This says to treat any assignment to that variable as an error. It may also …

Aug 20, 2024 · The const keyword in JavaScript is used to declare constants – variables whose values cannot be reassigned once they are initialized. This immutability brings a new level of …

Apr 16, 2025 · Learn how to declare constants in JavaScript using the const keyword, with examples and explanations.

This tutorial shows you how to use the JavaScript const keyword to declare constants whose values are immutable.

Oct 27, 2023 · The const keyword is used to declare a variable that can’t be changed after its declaration. This keyword is short for constant (which means “doesn’t change”), and it’s used …