Golang - Is string an object?

The most accurate answer is: No, a string in Go is not an "object" in the traditional OOP sense (like an instance of a class in Java or Python).

Here's a breakdown of why:

Go is Not Classically OOP: Go doesn't have classes. It uses structs to group data and allows methods to be defined on any named type (including structs and even basic types like int if you define a new type based on it).
String is a Built-in Primitive Type: string is one of Go's fundamental, built-in types, much like int, float64, bool, etc. You don't instantiate it from a String class.
Value Type Semantics: Strings in Go behave like value types. When you assign a string to another variable or pass it to a function, the string value (conceptually, a header containing a pointer to the underlying byte data and its length) is copied. Crucially, strings are immutable – you cannot change the contents of a string once it's created. Operations that appear to modify a string actually create and return a new string. This differs from many OOP objects which are often mutable reference types.
No User-Defined Methods Directly on string: While Go allows methods on types, you cannot define your own methods directly on the built-in string type itself. You can define methods on a custom type based on string (e.g., type MyString string), but not on string. Behavior associated with strings comes from built-in functions (like len()) and standard library packages (like strings, strconv).
Internal Representation: Internally, a Go string is represented by a small header structure containing a pointer to an immutable sequence of bytes and an integer representing the length. While it holds data (state), it doesn't encapsulate behavior through methods in the way OOP objects typically do.

In summary:

While strings hold data and have associated operations (via functions/packages), they lack the key characteristics of objects in classic OOP languages (like instantiation from classes, inheritance, and often mutability). It's more accurate to think of Go's string as a highly optimized, immutable, built-in value type representing a sequence of bytes.