JavaScript

Question 1

What is a first-class function?

Answer 1

A function that is treated like a value.

Examples:
Assign a function to a variable.
Pass a function as an argument.
Return a function.

Question 2

What is a variable?

Answer 2

A named reference to a value.

Question 3

What are primitives?

Answer 3

Data that is not an object and has no methods.

6 data types: string, number, bigint, boolean, undefined, symbol

Primitives are immutable

Question 4

What is null?

Answer 4

A special primitive object that represents a nonexistent object.