JavaScript Data Types

JavaScript has a variety of data types that are used to represent different kinds of data in programming. Understanding these data types is essential for effective coding in JavaScript.

Key Data Types in JavaScript

JavaScript primarily has two categories of data types:

1. Primitive Data Types
2. Non-Primitive Data Types (Reference Types)

1. Primitive Data Types

Primitive data types are the most basic forms of data and include the following:

• String
  • Represents a sequence of characters.
  • Example: "Hello, World!"
• Number
  • Represents both integer and floating-point numbers.
  • Example: 42, 3.14
• Boolean
  • Represents a logical entity that can be either true or false.
  • Example: true, false
• Undefined
  • A variable that has been declared but has not yet been assigned a value.
  • Example: let x; // x is undefined
• Null
  • Represents the intentional absence of any object value.
  • Example: let y = null;
• Symbol (ES6)
  • Represents a unique and immutable value primarily used as object property keys.
  • Example: let sym = Symbol('description');
• BigInt (ES11)
  • Represents integers with arbitrary precision, allowing for very large numbers.
  • Example: let bigNumber = 1234567890123456789012345678901234567890n;

2. Non-Primitive Data Types (Reference Types)

Non-primitive data types are more complex and include:

• Object
  • A collection of key-value pairs.
• Array
  • A special type of object that represents a list of values.
• Function
  • A block of code designed to perform a particular task.

Example:

function greet() {
    return "Hello!";
}

Example:

let fruits = ["Apple", "Banana", "Cherry"]; 

Example:

let person = {
    name: "John",
    age: 30
};

Conclusion

Understanding JavaScript data types is fundamental for programming in JavaScript. They help define what kind of data can be stored and manipulated within a program. Mastering these types will enhance your coding skills and enable you to write more efficient and error-free code.