Why Do Go Slice Range Loops Assign the Same Address to Map Keys When Using `&stu`?

Delving into Go Slice Range Phenomenon

In the provided code snippet, a slice of student structs is iterated over using the range keyword. However, the assignment of student addresses to a map reveals a seemingly perplexing issue: the resulting map keys have the same address.

To understand this phenomenon, it's crucial to recognize that in Go, the range keyword iterates over the elements of a slice, not the addresses. This means that the variable stu within the range loop is a copy of the slice element. Consequently, when the address of stu is taken and assigned to a map key, the address of the copy, not the slice element, is stored.

To rectify this, one needs to modify the code to explicitly take the address of the slice element. This can be achieved by using the slice index variable i:

for i := range s {
    m[s[i].Name] = &s[i]
}

This modification ensures that the map keys hold the addresses of the actual slice elements.

By understanding the distinction between iterating over slice elements and taking their addresses, developers can avoid potential confusion and ensure the intended behavior of their code when working with slices in Go.

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