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
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).
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D).
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 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 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 keyword is used to declare variables in JavaScript?
A). a. var
B). b. const
C). c. let
D). d. def
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 keyword is used to declare variables in JavaScript?
A). a. var
B). b. const
C). c. let
D). d. def
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 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