Let Hoisting Mockest | JavaScript

1.

What will be the output of the following code?

console.log(a); let a = 10;

A). undefined B). 10 C). null D). ReferenceError

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2.

In which scope are let variables hoisted?

A). Function scope B). Block scope C). Global scope D). Module scope

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3.

What will be the output of the following code?

{ console.log(b); let b = 20; }

A). 20 B). undefined C). null D). ReferenceError

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4.

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

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5.

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

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6.

What will be the output of the following code?

let c = 5; { let c = 10; console.log(c); }

A). 5 B). 10 C). ReferenceError D). undefined

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7.

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

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8.

What will be the output of the following code?

let d; console.log(d); d = 15;

A). undefined B). 15 C). null D). ReferenceError

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9.

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

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10.

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

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Let Hoisting Mocktest

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