In most languages, the stack and heap are two ways a program stores data in memory, managed by the language runtime. Each is optimized for different use cases, such as fast access or flexible lifetimes. Go follows the same model, but you usually don’...

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Escape analysis is how the Go compiler decides whether values live on the stack or heap. When the compiler can't prove a value is only needed within the current function, it "escapes" to the heap, increasing garbage collector work. The article explains stack frames, goroutine stacks, and pointer lifetimes, distinguishing between "sharing down" (passing pointers to callees) and "sharing up" (returning pointers or storing them in long-lived state). It demonstrates using compiler flags like `-gcflags='-m -l'` to inspect escape decisions and provides practical patterns to reduce heap allocations: prefer values for small data, use pointers deliberately for mutation or sharing, avoid accidental long-lived references, and reuse buffers in hot paths instead of allocating repeatedly.

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