Redeclaring Mockest | JavaScript

1.

What is variable redeclaring in JavaScript?

A). Changing the value of a variable B). Declaring the same variable again within the same scope C). Deleting a variable D). Assigning multiple values to a variable

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2.

Which keyword allows redeclaring variables in JavaScript?

A). let B). var C). const D). Both A and C

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3.

What is the behavior when redeclaring a variable with var in JavaScript?

A). SyntaxError is thrown B). No effect on the variable C). Variable value is changed D). Variable reference is updated

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4.

What is the behavior when redeclaring a variable with let or const in JavaScript?

A). SyntaxError is thrown B). No effect on the variable C). Variable value is changed D). Variable reference is updated

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5.

What is the output of the following code snippet?

A). 10 B). 20 C). 30 D). Error

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6.

Which keyword should you use to avoid redeclaring variables in JavaScript?

A). var B). let C). const D). Both B and C

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7.

What is the behavior of a redeclared variable in JavaScript?

A). It retains its original value B). It retains its last assigned value C). It becomes undefined D). It throws an error

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8.

What is the scope of a redeclared variable in JavaScript with var?

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

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9.

What is the scope of a redeclared variable in JavaScript with let or const?

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

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10.

Which statement about redeclaring variables in JavaScript is true?

A). Redeclaring variables is a best practice B). Redeclaring variables leads to clearer code C). Redeclaring variables can lead to confusion and bugs D). Redeclaring variables has no effect

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