英文:
What's the difference between make([]int, 0), []int{}, and *new([]int)?
问题
根据 https://play.golang.org/p/7RPExbwOEU 的内容，它们都打印相同的结果，并且具有相同的长度和容量。在初始化切片的三种方式中是否有区别？是否有首选的方式？我发现自己经常同时使用 make([]int, 0) 和 []int{}。
英文:
According to https://play.golang.org/p/7RPExbwOEU they all print the same and have the same length and capacity. Is there a difference between the three ways to initialize a slice? Is there a preferred way? I find myself using both make([]int, 0) and []int{} with the same frequency.
答案1
得分: 9
这是初始化一个长度为0的切片。
make([]int, 0)
使用make是初始化一个具有与长度不同的特定容量的切片的唯一方法。这将分配一个长度为0但容量为1024的切片。
make([]int, 0, 1024)
这是一个切片字面量，也会初始化一个长度为0的切片。使用这个或者make([]int, 0)完全是个人偏好。
[]int{}
这是初始化一个指向切片的指针，然后立即对其进行解引用。切片本身尚未初始化，仍然为nil，因此实际上什么也没做，等同于[]int(nil)。
*new([]int)
英文:
This initializes a 0 length slice.
make([]int, 0)
Using make is the only way to initialize a slice with a specific capacity different than the length. This allocates a slice with 0 length, but a capacity of 1024.
make([]int, 0, 1024)
This is a slice literal, which also initializes a 0 length slice. Using this or make([]int, 0) is solely preference.
[]int{}
This initializes a pointer to a slice, which is immediately dereferenced. The slice itself has not been initialized and will still be nil, so this essentially does nothing, and is equivalent to []int(nil)
*new([]int)
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