let and const is correct?
let and const are block scoped, but const cannot be re-assigned.
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 d; console.log(d); d = 15;A). undefined
B). 15
C). null
D). ReferenceError
In which scope are let variables hoisted?
A). Function scope
B). Block scope
C). Global scope
D). Module scope
What is the scope of a variable declared with let inside a loop?
A). Global scope
B). Function scope
C). Block scope
D). Module scope
Where should let variables be declared to avoid TDZ issues?
A). At the top of the global scope
B). At the bottom of their block scope
C). At the top of their block scope
D). Anywhere in the code
What will be the output of the following code?
let i = 50; { let i = 55; console.log(i); } console.log(i);A). 50 50
B). 55 50
C). 50 55
D). ReferenceError
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?
for (let i = 0; i < 3; i++) { setTimeout(() => console.log(i), 0); }A). 0 0 0
B). 3 3 3
C). 0 1 2
D). ReferenceError
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 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