Block Scope Mockest | JavaScript

11.

Which keyword is used to declare block-scoped variables in JavaScript?

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

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12.

What will be the output of the code above?

A). [1, 2, 3, 4] B). [1, 2, 3] C). [1, 2, 3, 4, 5] D). Error

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13.

Which keyword is used to declare a constant array in JavaScript?

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

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14.

What is the primary difference between const and let in JavaScript?

A). const variables can be reassigned B). let variables are block-scoped C). const variables are hoisted D). let variables are immutable

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15.

What will be logged to the console after 1 second?

A). 0 1 2 B). 3 3 3 C). 0 0 0 D). Error

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16.

Which statement is true regarding the const keyword in JavaScript?

A). Constants declared with const are hoisted B). Constants declared with const can be reassigned C). Constants declared with const have global scope D). Constants declared with const are immutable

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17.

What is the purpose of using block scope in JavaScript?

A). To declare constants B). To prevent variable hoisting C). To improve code performance D). To create global variables

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18.

What will be logged to the console?

A). "John" B). "Jane" C). Error D). Undefined

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19.

What is the purpose of using the const keyword in JavaScript?

A). To declare variables with global scope B). To declare block-scoped variables C). To declare variables that can be reassigned D). To declare variables that cannot be reassigned

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20.

What will be logged to the console?

A). "Alice" B). "Bob" C). TypeError D). Undefined

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Block Scope Mocktest

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