JavaScript, Everything in JavaScript is object. Is it true?

Everything in JavaScript is object. Is it true?

The statement "everything in JavaScript is an object" is somewhat misleading and not entirely accurate. While many things in JavaScript are objects or can be treated like objects, there are certain types of values that are not objects. Here’s a breakdown:

1. Primitive Data Types

JavaScript has seven primitive types, and these are not objects. They include:

String

Number

Boolean

BigInt

Symbol

Undefined

Null

Primitives differ from objects in that they are immutable (they cannot be changed once created) and are not instances of objects.

2. Wrapper Objects for Primitives

JavaScript provides wrapper objects for primitives, which allow you to treat them as if they were objects for the purpose of accessing methods. For example:

let str = "Hello";

console.log(str.length); // 5

Here, JavaScript temporarily wraps the string in a String object to access its .length property, but str itself remains a primitive value.

3. Functions

Functions in JavaScript are indeed objects. Specifically, they are instances of the Function object. This is why functions can have properties and methods.

4. Arrays

Arrays are also objects. They are instances of Array, which is a type of object specialized for handling indexed collections of data.

5. Special Objects Like null and undefined

null is considered a primitive type, but it is often thought of as an "empty" object reference. However, it is technically not an object itself.

undefined is also a primitive and not an object.

Summary

While JavaScript treats many things like objects and provides ways to interact with primitives as if they were objects (via wrapper objects), not everything in JavaScript is truly an object.