Can you list the main primitive and complex data types used in JavaScript?

In JavaScript, the following primitive data types exist:

• Number — a numeric type, e.g., 42, 3.14
• String — a string, e.g., "hello"
• Boolean — a logical type: true or false
• Undefined — the value of a variable that has not been assigned a value
• Null — a special value indicating "absence of a value"
• Symbol — a unique and immutable identifier
• BigInt — for working with integers of arbitrary length

Complex data types in JavaScript are represented by objects:

• Object — a collection of key-value pairs
• Array — an ordered list of values
• Function — an object that can be called
• Date, RegExp, and other built-in objects

Example:

const num = 10; // Number
const str = "text"; // String
const flag = true; // Boolean
const obj = {name: "Ivan", age: 30}; // Object
const arr = [1, 2, 3]; // Array