Answer & Solution
Answer: Option B
Solution:
In JavaScript, a variable's data type is determined at runtime and can change during execution.
Q
What does it mean that JavaScript is dynamically typed?
Related Questions on Average
What does the parseInt function do in JavaScript?
A). Converts a number to a string
B). Converts a string to an integer
C). Converts a boolean to a number
D). Converts an array to a number
Which operator is used to determine the type of a variable in JavaScript?
A). typeof
B). instanceof
C). type
D). isType
What will be the result of typeof function() {} in JavaScript?
A). function
B). object
C). undefined
D). method
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 does the isNaN function do?
A). Checks if a value is not a number
B). Converts a value to a number
C). Checks if a value is a number
D). Converts a value to NaN
Given let a = '10'; let b = 20;, what is the result of a + b?
A). 30
B). 1020
C). 30
D). NaN
What is the result of the following code: let x = 5; x = 'hello'; console.log(typeof x);?
A). number
B). string
C). undefined
D). object
Which of the following values is considered falsy in JavaScript?
A). 1
B). 0
C). 0
D). {}
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
What will typeof NaN return in JavaScript?
A). number
B). NaN
C). undefined
D). object