Answer & Solution
Answer: Option B
Solution:
The variable y is reassigned to a boolean value true, changing its type to boolean.
Q
Given the code: let y = 10; y = true;, what is the type of y after execution?
Related Questions on Average
In JavaScript, what will be the type of a variable x after x = 5 + true;?
A). number
B). string
C). boolean
D). undefined
How can you check if a variable is an array in JavaScript?
A). typeof variable === 'array'
B). Array.isArray(variable)
C). variable instanceof array
D). variable.constructor === array
Which type conversion happens automatically in the expression 3 + '5'?
A). Number to String
B). String to Number
C). Boolean to String
D). Number to Boolean
What is the type of the value returned by parseFloat('3.14abc')?
A). number
B). string
C). NaN
D). undefined
What does it mean that JavaScript is dynamically typed?
A). Variables do not have types
B). Variables can change type
C). Variables must be declared with a type
D). Variables cannot change type
What happens when you add a number and a string in JavaScript?
A). An error is thrown
B). The number is converted to a string
C). The string is converted to a number
D). Both are converted to boolean
What is the result of typeof [] in JavaScript?
A). array
B). object
C). list
D). undefined
What will typeof null return in JavaScript?
A). null
B). undefined
C). object
D). number
What is the initial type of a variable declared with let a;?
A). null
B). number
C). undefined
D). object
Given let a = '10'; let b = 20;, what is the result of a + b?
A). 30
B). 1020
C). 30
D). NaN