Let Hoisting Mockest | JavaScript

11.

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

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12.

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

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13.

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

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14.

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

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15.

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

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16.

Which keyword should be used to declare variables that do not get re-assigned?

A). let B). const C). var D). function

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17.

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

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18.

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

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19.

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

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20.

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

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Let Hoisting Mocktest

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