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What Is the Difference Between var, let, and const?

Which is better: var, let, or const?

The answer

In modern JavaScript, let and const are generally preferred over var.

More FAQs in What Is the Difference Between var, let, and const?

The variable reference cannot be reassigned, although object contents may still be modified.

No. var is function scoped.

No. let cannot be redeclared within the same scope.

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