In JavaScript, which of the following is used to declare a block-scoped variable?

Both let and const are used to declare block-scoped variables in JavaScript, which is why this answer is correct.

When you declare a variable with let, it is only accessible within the nearest enclosing block (such as a loop or an if statement), making it useful for situations where you want to limit the variable's scope to prevent accidental modification from outside the block.

Similarly, const also defines a block-scoped variable, but with a key distinction: while it protects the variable from being reassigned to a new value, it does allow for mutation of objects or arrays that are assigned to it. This means you cannot reassign a const variable, but you can still change properties or elements within an object or array declared as const.

In contrast, var declares variables that are function-scoped or globally-scoped and does not respect block scope. This means that a variable declared with var could be accessed outside of the block in which it was defined, leading to potential conflicts and unintended behaviors in code.

Thus, the use of let and const for block-scoped variable declarations helps in maintaining better control over variable accessibility and integrity within a specific block