let c = 5; { let c = 10; console.log(c); }let declaration inside the block creates a new variable that shadows the outer one, so it logs 10.
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
What is the 'temporal dead zone'?
A). The period during which a variable is declared but not yet initialized
B). The time when the variable is accessible throughout the program
C). The period after variable initialization
D). None of the above
What will be the output of the following code?
console.log(a); let a = 10;A). undefined
B). 10
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
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
What will be the output of the following code?
let e = 25; function test() { console.log(e); let e = 30; } test();A). 25
B). 30
C). undefined
D). ReferenceError
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 will be the output of the following code?
{ console.log(b); let b = 20; }A). 20
B). undefined
C). null
D). ReferenceError
In which scope are let variables hoisted?
A). Function scope
B). Block scope
C). Global scope
D). Module scope
How can you avoid variable hoisting issues with let?
A). Declare variables at the bottom of the code
B). Use var instead
C). Declare variables at the top of their scope
D). Do not declare variables