go slice
原文链接: go slice
var numbers = make([]int) // len 0 cap 0
var numbers = make([]int,5) // len 5 cap 5
var numbers = make([]int,3,5) // len 3 cap 5
对切片的各类操作,如去重Distinct,求交集InnerJoin,合集FullJoin等
func DeleteSlice(a []int) []int{
for i := 0; i < len(a); i++ {
if a[i] == 0 {
a = append(a[:i], a[i+1:]...)
i--
}
}
return a
}
1、基本用法:
a = append(a, b...)
例如:list = appened(list,[]int{1,2,3,4}...)
可以用来合并两个列表. 不用这样了 :list := make([]int,len(list1)+len(list2)) 然后再copy(list,list1) copy(list[len(list1):],list2)
2、Copy:
b = make([]T, len(a)) copy(b, a)
或者:
b = append([]T(nil), a...)
3、Cut:
a = append(a[:i], a[j:]...)
4、Delete:
a = append(a[:i], a[i+1:]...)
或者: a = a[:i+copy(a[i:], a[i+1:])]
例如:a[len(a)-1], a = nil, append(a[:i], a[i+1:]...)
5、Delete without preserving order:
a[i], a = a[len(a)-1], a[:len(a)-1]
例如: a[i], a[len(a)-1], a = a[len(a)-1], nil, a[:len(a)-1]
6、Expand:
a = append(a[:i], append(make([]T, j), a[i:]...)...)
7、Extend:
a = append(a, make([]T, j)...)
8、Insert:
a = append(a[:i], append([]T{x}, a[i:]...)...)
例如: s = append(s, 0) copy(s[i+1:], s[i:]) s[i] = x
9、InsertVector:
a = append(a[:i], append(b, a[i:]...)...)
10、Pop
x, a = a[len(a)-1], a[:len(a)-1]
11、Push:
a = append(a, x)
12、Shift
x, a := a[0], a[1:]
13、Unshift
a = append([]T{x}, a...)
14、Reversing:
for i := len(a)/2-1; i >= 0; i-- {
opp := len(a)-1-i a[i], a[opp] = a[opp], a[i]
}
for left, right := 0, len(a)-1; left < right; left, right = left+1, right-1 {
a[left], a[right] = a[right], a[left]
}