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 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
20 MCQ on Declaring (Creating) JavaScript Variables in 2000 words with example. in excel format with Question in Col A, Option A in Col B, Option B in col C, Option C in col D, Option D in col e, Right Answer in col f, Solution with explanation in col g without sno and options a,b,c,d and put all html tags in special container
A).
B).
C).
D).
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
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
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 variable names is valid in JavaScript?
A). a. my variable
B). b. _variable
C). c. 3variable
D). d. variable$
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 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 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