Data Types & Type Conversion Interview Questions

    Question 1: JavaScript Data Type of typeof null

    What is the result of typeof null in JavaScript?

    Question 2: Checking Not-a-Number (NaN)

    Which of the following is true about NaN in JavaScript?

    Question 3: Type of BigInt

    What is the type of the value 123n in JavaScript?

    Question 4: Type Conversion to Number

    What is the result of Number("123abc")?

    Question 5: Boolean Conversion Rule

    Which of the following values converts to false when used in Boolean conversion?

    Question 6: Type of Symbol

    What is the type of Symbol("id")?

    Question 7: String to Number Conversion

    What will be the result of "5" - 2 in JavaScript?

    Question 8: Implicit Conversion with + Operator

    What is the result of "5" + 2 in JavaScript?

    Question 9: Undefined Value Type

    What is the type of undefined in JavaScript?

    Question 10: Equality with Type Conversion

    What is the result of 0 == "0" in JavaScript?