Answer & Solution
Answer: Option B
Solution:
Declaring a variable without initializing it in JavaScript will assign it a default value of undefined.
Q
What happens if you declare a variable without initializing it in JavaScript?
Related Questions on Average
What will be the output of the following code: console.log(typeof 'Hello');?
A). string
B). number
C). undefined
D). boolean
What is the value of x after the following code executes: let x = 5; x *= 2; x /= 3;?
A). 04-Oct
B). 6666666666667
C). 5
D). undefined
Which keyword is used to declare a constant variable in JavaScript?
A). const
B). let
C). var
D). constant
What will be the output of the following code: console.log('Hello ' + 'World');?
A). Hello World
B). Hello + World
C). Hello +World
D). HelloWorld
Which data type is used to represent whole numbers in JavaScript?
A). number
B). integer
C). float
D). string
What is the purpose of using the === operator in JavaScript?
A). Strict equality comparison
B). Loose equality comparison
C). Assignment operator
D). Addition operator
What is the keyword used to declare variables in JavaScript?
A). let
B). variable
C). var
D). const
What will be the value of x after the following code executes: let x = 10; x += 5;?
A). 15
B). 5
C). 10
D). undefined
Which symbol is used for string concatenation in JavaScript?
A). +
B). -
C). *
D). /
What will be the value of x after the following code executes: let x = '5' + 5;?
A). '55'
B). 10
C). 5
D). '10'