Golang切片不像JS中的数组，一些常用的方法得自己实现
1. push
func push(s []int, e int) []int {
return append(s, e)
}
2. pop
func pop(s []int) ([]int, int) {
l := len(s)
if l == 0 {
return l, 0
}
return s[:l-1], s[l-1]
}
3. unshift
func unshift(s []int, e int) []int {
return append([]int{e}, s...)
}
4. shift
func shift(s []int) ([]int, int) {
return s[1:], s[0]
}
5. slice
func sliceInGo(s []int, start int, end int) []int {
return s[start: end]
}
6. splice
func splice(s []int, start int, deleteCount int, elements ...int) []int {
end := start + deleteCount
s = append(s[:start], elements... ,s[end:]...)
return s
}
7. concat
func concat(s1, s2 []int) []int {
return append(s1, s2...)
}
8. indexOf
func indexOf(s []int, e int) int {
for i, v := range s {
if v == e {
return i
}
}
return -1
}
9. includes
func includes(s []int, e int) bool {
for _, v := range s {
if v == e {
return true
}
}
return false
}
10. reverse
func reverse(s []int) []int {
length := len(s)
for i := 0; i < length/2; i++ {
s[i], s[length-1-i] = s[length-1-i], s[i]
}
return s
}
11. map
func mapInGo(s []int, cb func(v int, idx int) int) []int {
ret := make([]int, len(s))
for i, v := range s {
ret[i] = cb(v, idx)
}
return ret
}
12. forEach
func forEach(s []int, cb func(v int, idx int)) {
for i, v := range s {
cb(v, i)
}
}
13. filter
func filter(s []int, cb func(v int, idx int) bool) []int {
ret := make([]int, 0)
for i, v := range s {
if cb(v) {
ret = append(ret, v)
}
}
return ret
}
