When changing capacity, where will the new slice be located in memory?

In Go, a slice is a structure that contains a pointer to an array, a length, and a capacity. When you increase the capacity of a slice (for example, when adding elements using append), if the current array cannot hold the new data, a new larger array is created.

The new slice will point to this new array, which is allocated in another area of memory (usually on the heap). The old array remains in memory until there are no more references to it, after which the garbage collector will free it.

Example:

s := make([]int, 0, 2) // capacity = 2
s = append(s, 1, 2)     // array is filled
s = append(s, 3)        // capacity increases, a new array is allocated

Thus, when increasing the capacity of a slice, a new array is created in memory, and the slice starts referencing it.