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JavaScript Institute Variables and Data Types Quiz

Test your understanding of JavaScript variables and data types at the college level. This quiz covers variable declaration methods, primitive and complex data types, type coercion, and best practices for working with data in...

Questions: 20 | Attempts: 10 | Last updated: Aug 11, 2026

Sample Question 1
What is the primary difference between `let` and `var` in JavaScript?

`let` is function-scoped; `var` is block-scoped

`let` is block-scoped; `var` is function-scoped

There is no difference; they are aliases

`var` cannot be reassigned; `let` can be

Sample Question 2
Which keyword should you use for variables that will never be reassigned?

Var

Let

Const

Static

Sample Question 3
What is the result of `typeof null` in JavaScript?

Null

Object

Undefined

NaN

JavaScript Institute JSE / JSA Quizzes, Questions & Answers

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