package main
import (
 "fmt"
)
func main() {
 fmt.Println(reverse([]byte{11,22,33,44}))
}
func reverse(s []byte) []byte {
 for i, j := 0, len(s)-1; i < j; i, j = i+1, j-1 {
 s[i], s[j] = s[j], s[i]
 }
 return s
}

type slice struct {
 array unsafe.Pointer
 len  int
 cap  int
}

func remove(slice []int, i int) []int {
  copy(slice[i:], slice[i+1:])
  return slice[:len(slice)-1]
}
 
func main() {
  s := []int{5, 6, 7, 8, 9}
  fmt.Println(remove(s, 2)) // "[5 6 8 9]"
}

type funcType func(T) bool //代表筛选逻辑函数，可以按需实现
 
func filter(a []T, f funcType) []T {
  b := a[:0]
  for _, x := range a {
    if f(x) { 
      b = append(b, x)
    }
  }
  return b
}

func reverse(a []T) []T {
  for i := len(a)/2-1; i >= 0; i-- {
    opp := len(a)-1-i
    a[i], a[opp] = a[opp], a[i]
  }    
  return a
}

func chunk(actions []int, batchSize int) []int {
  var batches [][]int
 
  for batchSize < len(actions) {
    actions, batches = actions[batchSize:], append(batches, actions[0:batchSize:batchSize])
  }
  batches = append(batches, actions)    
  return batches
}
 
func main() {
  actions := []int{0, 1, 2, 3, 4, 5, 6, 7, 8, 9}
  batchSize := 3
  chunks = chunk(actions, batchSize)
  //chunks 为[[0 1 2] [3 4 5] [6 7 8] [9]]
}

import "sort"
 
func main() {
  in := []int{3,2,1,4,3,2,1,4,1} // any item can be sorted
  sort.Ints(in)
  j := 0
  for i := 1; i < len(in); i++ {
    if in[j] == in[i] {
      continue
    }
    j++
 
    in[j] = in[i]
  }
  result := in[:j+1]
  fmt.Println(result) // [1 2 3 4] 
}