10 examples of 'golang clear slice' in Go

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24func Slice(arr []byte, count int) [][]byte {
25
26 sliceCount := len(arr) / count
27 result := make([][]byte, sliceCount)
28
29 for i := 0; i < sliceCount; i++ {
30 start := i * count
31 end := i*count + count
32
33 result[i] = arr[start:end]
34 }
35
36 return result
37}
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80func (x AstSlice) Slice(lo, hi int) AstWithSlice { x.X = x.X[lo:hi]; return x }
221func (r *Repo) clearSliceIfPossible(dest interface{}) {
222 v := reflect.ValueOf(dest)
223 vt := v.Type()
224
225 if vt.Kind() != reflect.Ptr {
226 log.Warn("cannot clear slice: dest is not pointer")
227 return
228 }
229
230 if vt.Elem().Kind() != reflect.Slice {
231 log.Warn("cannot clear slice: dest is a pointer, but not to a slice")
232 return
233 }
234
235 reflect.Indirect(v).SetLen(0)
236}
53func (a *strings) Slice(start, stop int) array.BaseRef {
54 return a.StringSlice(start, stop)
55}
103func slice(s string, from int, to int) string {
104 from = maxInt(from, 0)
105 to = minInt(to, len(s))
106 return s[minInt(from, to):to]
107}
363func (sc scopedArray) Slice(from, to int64) msg.Source { return sc.under.Slice(from, to) }
272func reverseByteSlice(slice []byte) {
273 for i, j := 0, len(slice)-1; i < j; i, j = i+1, j-1 {
274 slice[i], slice[j] = slice[j], slice[i]
275 }
276}
415func (v *BaseKParserVisitor) VisitSlice(ctx *SliceContext) interface{} {
416 return v.VisitChildren(ctx)
417}
13func (n Nodes) Slice(offset, count int) changes.Collection {
14 return n[offset : offset+count]
15}
11func sliceDemo2() {
12 slice1 := []int{1, 2, 3}
13 printSlice(slice1)
14 // slice1[len(slice1)] = 4 // 虽然是不定长的切片,但是一旦赋值容量就固定了,这里会报错
15
16 //指定容量
17 slice1 = make([]int, 3, 5) // 3 是长度 5 是容量
18 printSlice(slice1)
19
20 // slice1[len(slice1)] = 4 // 还是会报错,虽然容量是 5 ,但是数组长度是3,这里是以长度为准,而不是容量
21
22 //使用append来追加元素,append很常用
23 slice1 = append(slice1, 4)
24 printSlice(slice1)
25
26 slice1 = append(slice1, 5)
27 slice1 = append(slice1, 6) // 到这里长度超过了容量,容量自动翻倍为 5*2
28 printSlice(slice1)
29
30 // 上面容量自动翻倍的过程可以看作和下面一致
31 slice1 = make([]int, 3, 5) // 3 是长度 5 是容量
32 slice1 = append(slice1, 4)
33 slice1 = append(slice1, 5)
34
35 // 长度不变,容量自动翻倍为 5*2
36 slice2 := make([]int, len(slice1), (cap(slice1))*2)
37
38 /* 拷贝 slice1 的内容到 slice2 */
39 copy(slice2, slice1) // 注意是后面的拷贝给前面
40 slice2 = append(slice2, 6)
41 printSlice(slice2)
42
43}

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