// You can create a constant array: const cars = ["Saab", "Volvo", "BMW"]; // You can change an element: cars[0] = "Toyota"; // You can add an element: cars.push("Audi");

Mar 19, 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 object, its properties can be added, updated, or removed.

ES6 provides a new way of declaring a constant by using the const keyword. The const keyword creates a read-only reference to a value. By convention, the constant identifiers are in uppercase. Like the let keyword, the const keyword declares blocked-scope variables.

Sep 25, 2008 · Introducing constants into JavaScript is at best a hack. A nice way of making persistent and globally accessible values in JavaScript would be declaring an object literal with some "read-only" properties like this:

Feb 12, 2025 · It is used to declare variables whose values need to remain constant throughout the lifetime of the application. const is block-scoped, similar to let, and is useful for ensuring immutability in your code. Unlike let, the primary feature of const is that it cannot be reassigned once it has been initialized. Syntax.

Creating a variable in JavaScript is called "declaring" a variable: A const variable must be assigned when it is declared. Required. The name of the variable. Required. A value to be assigned to the variable. When to use JavaScript const? As a general rule, always declare a variable with const unless you know that the value will change.

I have been trying to find a way to find all constants in javascript. I have found I can get all global variables with for (let i in window) { console.log(i); };

Jun 5, 2024 · 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 value of a constant won't automatically appear anywhere except in the constant itself. If you want to access it via a string, then store it as a property of an object (preferably not the global object though, that's a disorganised mess with a significant risk of clashing with other code).

To declare a constant in JavaScript, we use the keyword const instead of var or let. Just like with variables, we must also assign an initial value to the constant at the time of declaration. Next, we explain how to declare constants and provide well-documented examples. Syntax for declaring constants. The syntax for declaring a constant in ...