Primitive and Object types in JavaScript

In JavaScript, there are two main data types: primitive and object types. Understanding the differences between these two types is important for writing effective and efficient code.

Primitive Types

Primitive types in JavaScript include:

• String
• Number
• Boolean
• Undefined
• Null

Primitive types are immutable, meaning they cannot be changed. When you assign a new value to a variable that holds a primitive type, the original value is replaced.

Object Types

Object types in JavaScript include:

• Object
• Array
• Function
• Date

Object types are mutable, meaning they can be changed. When you assign a new value to a variable that holds an object type, the original value is not replaced, but rather modified. Object types are also passed by reference, whereas primitive types are passed by value.

Using Primitive and Object Types

When working with JavaScript, it’s important to understand how to properly use both primitive and object types. For example, when comparing two variables that hold primitive types, you can use the “===” operator to compare their values. However, when comparing two variables that hold object types, you will need to compare their references using the “===” operator.

Knowing the differences between primitive and object types in JavaScript allows you to write more efficient and effective code, and understand how data is stored and manipulated in your programs.