JavaScript

In JavaScript, you can declare an array using const to make sure the variable cannot be reassigned. But remember: const does not make the array immutable — you can still modify its contents.

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✅ Declaring an Array with const

const fruits = ["Apple", "Banana", "Mango"];

console.log(fruits); // ["Apple", "Banana", "Mango"]

🔹 You must assign a value when using const. You cannot declare it and assign later.

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❌ Reassignment is Not Allowed

const colors = ["Red", "Green"];
colors = ["Blue", "Yellow"]; // ❌ Error: Assignment to constant variable

You cannot reassign a new array to the same const variable.

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✅ But You CAN Modify the Elements

You can add, remove, or change elements in a const array.

const numbers = [1, 2, 3];

numbers[0] = 10;            // ✅ Changing an element
numbers.push(4);            // ✅ Adding an element
numbers.pop();              // ✅ Removing last element

console.log(numbers); // [10, 2, 3]

const protects the binding, not the data inside the array.

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✅ When to Use const with Arrays

• Use const when the reference should not change.
• It helps prevent bugs caused by accidental reassignment.
• Still gives flexibility to work with the array contents.

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📌 Summary

Feature	Behavior with const Arrays
Reassigning the whole array	❌ Not allowed
Modifying values	✅ Allowed
Using array methods (push, pop, etc.)	✅ Allowed
Must assign a value initially	✅ Yes, required

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🧠 Final Note

Using const with arrays is a best practice when you want to:

• Maintain a fixed reference
• Avoid reassignment errors
• Still work with the array data flexibly

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