Brief introduction
Built-in functions used to make slice, map or allocate memory and initialize chan type of an object (note: this can only be used in three types)
Code
Use make to create a slice, map, chanel follows:
slice
// 长度为5，容量为10的slice，slice中的元素是int
var slice_ []int = make([]int,5,10)
fmt.Println(slice_)
var slice_1 []int = make([]int,5)
fmt.Println(slice_1)
var slice_2 []int = []int{1,2}
fmt.Println(slice_2)
Print Results:
[0 0 0 0 0]
[0 0 0 0 0]
[1,2]
Capacity of the slice is arranged (i.e., the length of the underlying array) with the third parameter. If sufficient capacity can be pre-, then the growth process of the data slice does not require replacement of the underlying array (with the copying process), so that a higher efficiency.
map
var m_ map[string]int = make(map[string]int)
m_["one"] = 1
fmt.Println(m_)
var m map[string]int = map[string]int{"1":1}
m["2"] = 2
fmt.Println(m)
Print Results:
map[one:1]
map[1:1 2:2]
According to the memory size to the size of the initial assignment, but the length of the distribution map is 0, if the size is ignored, then allocates a small-sized memory when allocating memory initialization
channel
Pipe buffer is initialized based buffer capacity. If the capacity is zero or negligible capacity, there is no pipeline buffer
