make（[] int，0），[] int {}和* new（[] int）之间有什么区别？

Question

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.

Answer 1

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)