在Go中傳遞切片時，通常直接按值傳遞即可，因為切片頭包含指向底層數組的指針，複製切片頭不會復制底層數據，因此函數內對元素的修改會影響原切片；1. 若需在函數內重新賦值或調整切片長度並讓變更生效，應傳遞切片指針；2. 否則直接傳切片即可，無需使用指針；3. 使用append時若可能觸發(fā)重新分配，則必須通過指針傳遞才能使外部看到更新後的切片。因此，除非要替換整個切片，否則應以值的方式傳遞切片。

In Go, passing a slice to a function is straightforward— you pass it directly by value , but under the hood, it's more efficient than it might seem.

Slices are reference-like types

Even though Go passes arguments by value, a slice contains a header that references the underlying array . When you pass a slice to a function, a copy of this header is made (not the entire data), so the function can still access and modify the same underlying elements.

This means:

• You don't need to pass a pointer to a slice in most cases.
• Modifications to the elements of the slice inside the function will affect the original slice.

 func modifySlice(s []int) {
    s[0] = 999 // This will affect the original slice
}

func main() {
    data := []int{1, 2, 3}
    modifySlice(data)
    fmt.Println(data) // Output: [999 2 3]
}

When should you use a pointer to a slice?

You only need to pass a pointer to a slice if you plan to:

• Reassign the slice itself (eg, make it point to a new underlying array).
• Resize it in a way that requires a new allocation and want that change reflected outside.

 func resizeSlice(s *[]int) {
    *s = append(*s, 4, 5, 6) // Reassigns the slice
}

func main() {
    data := []int{1, 2, 3}
    resizeSlice(&data)
    fmt.Println(data) // Output: [1 2 3 4 5 6]
}

Without the pointer, append could reallocate and the caller wouldn't see the updated slice.

Key points to remember

• ? Pass slices directly: func f(s []int)
• ? Changes to elements are visible to the caller
• ? Avoid unnecessary pointers unless reassigning the slice
• ?? append may not affect the original if you don't use a pointer (when capacity is exceeded and reallocation happens)

Summary

Just pass the slice normally unless you're changing its length and need that change to persist. The slice header includes a pointer to the data, so it's efficient and shared by default—no need to overuse pointers.

Basically, pass slices by value unless you're replacing the whole slice .

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