Stack vs Heap in Go

Go's compiler automatically decides whether to allocate a variable on the stack or the heap based on escape analysis. If the compiler determines a variable's lifetime extends beyond the function scope (e.g., it is returned or stored in a global), it "escapes" to the heap; otherwise, it stays on the stack for faster access. You can inspect these decisions by compiling with the -m flag to see optimization notes.

go tool compile -m yourfile.go

The output will list variables that escape to the heap, such as moves result to heap, indicating the compiler's allocation choice.

Go automatically chooses the fastest place to store your data: the stack for short-lived items and the heap for long-lived ones. Think of the stack as a temporary desk for quick tasks and the heap as a warehouse for items you need to keep around. You don't need to manage this manually; the compiler figures it out for you.