Const Hoisting Mockest | JavaScript

11.

What is the output of the following code snippet?

A). TypeError B). 10 C). undefined D). SyntaxError

12.

How does hoisting differ between let and var declarations in JavaScript?

A). Both let and var variables are hoisted with their initial values B). let variables are hoisted with their initial values, var variables are hoisted with undefined C). let variables are not hoisted, var variables are hoisted with their initial values D). Hoisting behavior is the same for let and var declarations

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13.

What is the behavior of accessing a var variable within a block before its declaration in JavaScript?

A). ReferenceError is thrown B). SyntaxError is thrown C). undefined is printed D). No error

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14.

What happens if you declare a const variable with the same name as an existing variable in JavaScript?

A). SyntaxError is thrown B). The existing variable is reassigned C). ReferenceError is thrown D). TypeError is thrown

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15.

How does hoisting affect variable shadowing in JavaScript?

A). It allows variables with the same name in different scopes to coexist B). It prevents variables with the same name in different scopes from coexisting C). It has no effect on variable shadowing D). It automatically renames variables with the same name

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16.

What is the behavior of accessing a const variable before its declaration in a nested block in JavaScript?

A). ReferenceError is thrown B). SyntaxError is thrown C). undefined is printed D). No error

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17.

How can you ensure that a const variable is initialized before use in JavaScript?

A). Use let instead of const for all variables B). Declare const variables at the top of their scope C). Assign a default value to const variables D). None of the above

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18.

What is the purpose of the Temporal Dead Zone (TDZ) in JavaScript?

A). To prevent variable reassignment B). To catch errors at compile time C). To ensure variables are initialized before use D). To reduce memory usage

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19.

How does hoisting affect arrow functions in JavaScript?

A). Arrow functions are hoisted with their function bodies B). Arrow functions are hoisted but cannot be accessed before declaration C). Arrow functions are not hoisted D). Hoisting has no effect on arrow functions

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20.

What is the behavior of accessing a const variable within a function before its declaration in JavaScript?

A). ReferenceError is thrown B). SyntaxError is thrown C). undefined is printed D). No error

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Const Hoisting Mocktest

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