Q
What is the outcome of console.log(typeof x); if x is declared but not initialized in JavaScript?

Answer & Solution

Answer: Option a
Solution:
When a variable is declared but not initialized, its type is undefined in JavaScript. The correct option is a. Undefined.
Related Questions on Average

What is the outcome of console.log(typeof x); if x is declared but not initialized in JavaScript?

A). a. Undefined

B). b. Null

C). c. Error

D). d. Object

What will console.log(a); output if a is declared outside a function but inside a block using let in JavaScript?

A). a. It will output the value of a

B). b. It will throw an error

C). c. It will output undefined

D). d. It

Which of the following statements is true about the let keyword in JavaScript?

A). a. Variables declared with let have global scope

B). b. Variables declared with let are block-scoped

C). c. let is used to declare constants

D). d. let is used to declare functions

Which of the following variable names is valid in JavaScript?

A). a. my variable

B). b. _variable

C). c. 3variable

D). d. variable$

What will happen if you try to reassign a value to a constant declared with const in JavaScript?

A). a. It will throw an error

B). b. It will silently ignore the assignment

C). c. It will convert the variable to let

D). d. It will convert the variable to var

What does hoisting refer to in JavaScript variable declarations?

A). a. Declaring a variable multiple times

B). b. Initializing a variable before declaring

C). c. Moving variable declarations to the top

D). d. Using undeclared variables

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

A). a. To declare variables with function scope

B). b. To declare variables with block scope

C). c. To declare constants with immutable values

D). d. To declare objects in JavaScript

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

A). a. To declare variables with function scope

B). b. To declare variables with block scope

C). c. To declare constants with immutable values

D). d. To declare objects in JavaScript

What keyword is used to declare variables in JavaScript?

A). a. var

B). b. const

C). c. let

D). d. def

Which keyword is used to declare a variable that cannot be reassigned in JavaScript?

A). a. var

B). b. let

C). c. const

D). d. mutable