What is the difference between
var a [4]int
andb := make([]int, 4)
? Theb
can be extended, but nota
, right? But if I know that I need really i.e. 4 elements, then is an array faster then a slice?Is there any performance difference between
var d []int
ande := make([]int)
? Wouldf := make([]int, 5)
provide more performance than without the length for the first i.e. 5 elements?Would this
c := make([]int, 5, 10)
not allocate more memory than I can access?
为什么要使用make()在Go中创建切片?
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- dongzhan5246 2013-02-24 03:02关注
-
a
is an array, andb
is an slice. What makes slices different from arrays is that a slice is a pointer to an array; slices are reference types, which means that if you assign one slice to another, both refer to the same underlying array. For instance, if a function takes a slice argument, changes it makes to the elements of the slice will be visible to the caller, analogous to passing a pointer to the underlying array(Above from Learning Go). You can easily useappend
andcopy
with slice. Array should be a little faster than slice, but it doesn't make much difference. Unless you know the size exactly, it would be better to use slice which make things easy. - make([]type,length, capacity), you can estimate the size and possible capacity to improve the performance.
More details, you can refer:Go Slices: usage and internals
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