Which statement about var, let, and const is true?

Which statement about var, let, and const is true?

• A. Let is block-scoped and can be reassigned.
• B. Var is block-scoped and cannot be redeclared.
• C. Const is block-scoped and can be redeclared.
• D. Let is block-scoped and can be redeclared in the same scope.

Answer: (A)

In JavaScript, how a variable is declared affects where it’s accessible and whether its binding can change. Let creates a block-scoped binding, and that binding can be reassigned over time. For example, let x = 1; x = 2; is valid, illustrating reassignment. The same block cannot have another declaration of the same name with let, so redeclaration in the same scope isn’t allowed.

This aligns with the statement that describes let as block-scoped and capable of reassignment, making it the true description. By contrast, var is function-scoped and can be redeclared in the same scope, const is block-scoped but cannot be reassigned (though objects declared with const can have their internal properties mutated).