Answer & Solution
Answer: Option C
Solution:
Variables have an 'Undefined' value when they are declared but not initialized, meaning they exist in memory but haven't been given a specific value yet.
Q
When does a variable typically have an 'Undefined' value?
Related Questions on Average
What is the purpose of using 'Null' over 'Undefined' in certain programming scenarios?
A). To represent an intentional absence of value or object reference.
B). To assign default values to variables.
C). To represent uninitialized variables.
D). To check for variable existence.
How does the typeof operator behave when applied to an 'Undefined' value?
A). It returns 'undefined'.
B). It returns 'null'.
C). It throws an error.
D). It returns 'object'.
Which of the following statements is correct regarding the comparison of 'Undefined' and 'Null'?
A). Undefined and Null are strictly equal in JavaScript.
B). Undefined and Null are not strictly equal in JavaScript.
C). Undefined is considered a subtype of Null.
D). Null is considered a subtype of Undefined.
Which of the following is an example of using 'Null' in JavaScript?
A). let user = null;
B). let user = undefined;
C). let user;
D). let user = '';
What happens when a function does not explicitly return a value in JavaScript?
A). It returns 'null'.
B). It returns 'undefined'.
C). It throws an error.
D). It returns 'object'.
How do you check if a variable has an 'Undefined' value in JavaScript?
A). Using the undefined keyword.
B). Using the null keyword.
C). Using the typeof operator.
D). Using the empty keyword.
Which of the following statements is true regarding the behavior of 'Undefined' and 'Null' in JavaScript?
A). Undefined and Null are both falsy values in JavaScript.
B). Undefined and Null are both truthy values in JavaScript.
C). Undefined and Null have the same data type in JavaScript.
D). Undefined and Null cannot be compared in JavaScript.
Which of the following scenarios is a common cause of variables having an 'Undefined' value?
A). When variables are explicitly set to 'Undefined'.
B). When variables are declared but not initialized.
C). When variables are intentionally set to 'Null'.
D). When variables are assigned default values.
What does the expression typeof null return in JavaScript?
A). null
B). object
C). undefined
D). function
What is the result of the expression typeof undefinedVariable if undefinedVariable is not declared?
A). object
B). function
C). undefined
D). null