Q
Which of the following variable names is valid in JavaScript?

Answer & Solution

Answer: Option b
Solution:
Variable names in JavaScript can contain letters, digits, underscores, and dollar signs, but they cannot start with a digit. The correct option is b. _variable.
Related Questions on Average

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

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

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

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

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

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

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