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JavaScript is a dynamically typed language, meaning variables can hold values of any type without explicit type declaration. JavaScript data types are divided into two categories: primitive and non-primitive (reference) types.

Primitive Data Types:

1. number: Represents numeric values, including integers and floating-point numbers.

   let age = 25;
   let price = 99.99;
   

2. string: Represents textual data enclosed in single or double quotes.

   let name = 'Alice';
   

3. boolean: Represents a logical value: true or false.

   let isActive = true;
   

4. undefined: Represents a variable that has been declared but not assigned a value.

   let x;
   console.log(x); // undefined
   

5. null: Represents an intentional absence of any object value.

   let y = null;
   

6. bigint: Represents integers larger than the number type can handle.

   let bigNumber = 1234567890123456789012345678901234567890n;
   

7. symbol: Represents a unique and immutable value, often used as object property keys.

   let id = Symbol('id');
   

Non-Primitive Data Types:

1. object: Represents a collection of key-value pairs. This includes arrays, functions, and objects.

   let person = { name: 'Alice', age: 25 };
   let colors = ['red', 'green', 'blue'];
   

2. function: Functions are objects that can be called to perform tasks.

   function greet() {
       console.log('Hello!');
   }
   

Type Checking:

• Use the typeof operator to check the type of a value.

  console.log(typeof 42); // "number"
  console.log(typeof 'Hello'); // "string"
  console.log(typeof {}); // "object"
  console.log(typeof function() {}); // "function"
  

Connections:

• JS-003: typeof Operator in JavaScript
• JS-005: Functions in JavaScript

Connections:

Sources:

• From: Una breve guía a la programación y JavaScript