Answer & Solution
let
declarations inside a loop are confined to the block scope of the loop.
let
inside a loop?
let
declarations inside a loop are confined to the block scope of the loop.
Which of the following is true about let
declarations?
A). They are hoisted and initialized at the top of their scope
B). They are hoisted but not initialized
C). They are not hoisted at all
D). They are function scoped
What will be the output of the following code?
let f = 10; if (true) { console.log(f); let f = 20; }
A). 10
B). 20
C). undefined
D). ReferenceError
What will be the output of the following code?
{ console.log(b); let b = 20; }
A). 20
B). undefined
C). null
D). ReferenceError
What will be the output of the following code?
let h = 40; { console.log(h); h = 45; } console.log(h);
A). 40 45
B). 45 45
C). undefined undefined
D). ReferenceError 45
In which scope are let
variables hoisted?
A). Function scope
B). Block scope
C). Global scope
D). Module scope
Which keyword should be used to declare variables that do not get re-assigned?
A). let
B). const
C). var
D). function
What is the advantage of using let
over var
?
A). let
allows for function scoping
B). let
does not get hoisted
C). let
avoids issues related to the temporal dead zone
D). let
is globally scoped
Which statement about let
and const
is correct?
A). Both are block scoped, but only let
can be re-assigned
B). Both are block scoped, but only const
can be re-assigned
C). Only const
is block scoped
D). Both are not block scoped
What happens when you try to re-declare a let
variable in the same scope?
A). It reassigns the value
B). It throws a SyntaxError
C). It re-declares the variable
D). It throws a TypeError
What is the difference between let
and var
in terms of scope?
A). let
is function scoped, var
is block scoped
B). let
is block scoped, var
is function scoped
C). Both are function scoped
D). Both are block scoped