Web Reference: 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 object, its properties can be added, updated, or removed. JavaScript const variables must be assigned a value when they are declared: When to use JavaScript const? Always declare a variable with const when you know that the value should not be changed. Use const when you declare: The keyword const is a little misleading. It does not define a constant value. It defines a constant reference to a value. 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 lifetime of the application. const is block-scoped, similar to let, and is useful for ensuring immutability in your code.
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