How Go Strings Work Internally

Go strings are immutable sequences of bytes stored as a header containing a pointer to the data and a length. Because the data is immutable, operations like concatenation or substring extraction create new string headers pointing to new or existing byte slices rather than modifying the original.

s := "hello"
// s is a struct { ptr *byte; len int }
// s[0] is 'h', s[1] is 'e', etc.
// s = s + " world" creates a new string, leaving original "hello" unchanged

A Go string is like a sealed envelope containing text; you can read what's inside, but you cannot change the text without opening it and writing a new envelope. This design ensures that string data remains safe and consistent throughout your program, preventing accidental corruption when multiple parts of your code reference the same text.