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

Answer & Solution

Answer: Option b
Solution:
Variables declared with let have block scope. If a is declared outside a function but inside a block using let, it will result in a reference error when accessed outside that block. The correct option is b. It will throw an error.
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

Which of the following variable names is valid in JavaScript?

A). a. my variable

B). b. _variable

C). c. 3variable

D). d. variable$

What keyword is used to declare variables in JavaScript?

A). a. var

B). b. const

C). c. let

D). d. def

Which of the following variable names is valid in JavaScript?

A). a. my variable

B). b. _variable

C). c. 3variable

D). d. variable$

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

What keyword is used to declare variables in JavaScript?

A). a. var

B). b. const

C). c. let

D). d. def

What is the difference between var and let in terms of scope in JavaScript?

A). a. Both have function scope

B). b. Both have block scope

C). c. var has block scope, let has function scope

D). d. var has function scope, let has block scope

What is the difference between var and let in terms of scope in JavaScript?

A). a. Both have function scope

B). b. Both have block scope

C). c. var has block scope, let has function scope

D). d. var has function scope, let has block scope

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 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