Question

The let keyword cannot be used ___________

(a) as a substitute of var

(b) as a block statement to define new variables

(c) to define variables that are scoped to a single expression

(d) in a else if loop, as a substitute for var

I have been asked this question in an interview for job.

My enquiry is from JavaScript Extensions topic in division Classes and Modules in JavaScript of JavaScript

Answer 1

Right option is (d) in a else if loop, as a substitute for var

The explanation is: The let keyword can be used in four ways :

as a variable declaration like var;

in a for or for/in loop, as a substitute for var;

as a block statement, to define new variables and explicitly delimit their scope; and

to define variables that are scoped to a single expression.