Q
What is the default scope of variables declared with the 'var' keyword in JavaScript?

Answer & Solution

Answer: Option B
Solution:
Variables declared with 'var' are function-scoped, meaning they are accessible within the function they are declared in.
Related Questions on Average

What will be the output of the following code: const z = 30; z = 40; console.log(z);

A). 30

B). 40

C). Error

D). undefined

What will be the output of the following code: var x = 5; var x = 10; console.log(x);

A). 5

B). 10

C). Error

D). undefined

What will be the output of the following code: if (true) { let b = 60; } console.log(b);

A). 60

B). undefined

C). Error

D). null

What will be the output of the following code: const d = 90; d = 100; console.log(d);

A). 90

B). 100

C). Error

D). undefined

What will happen if you declare a variable without 'var', 'let', or 'const'?

A). Creates a global variable

B). Creates a block-scoped variable

C). Creates a function-scoped variable

D). Throws an error

Which keyword is used for declaring variables that should not change?

A). var

B). let

C). const

D). all of the above

Which keyword allows block-scoped variable declaration?

A). var

B). let

C). const

D). Both B and C

How does 'let' handle variable re-declaration in the same scope?

A). Allows it

B). Silently ignores

C). Throws an error

D). Creates a new variable

How does 'let' differ from 'var' in terms of scope?

A). No difference

B). Function-scoped

C). Block-scoped

D). Global-scoped

What will be the output of the following code: console.log(a); var a = 50;

A). 50

B). undefined

C). Error

D). null