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. 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: A new Array A new Object A new Function A new RegExp 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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