在golang中连接uuid

Question

我读了 here how to convert string efficiently in GO using either bytes.Buffer or strings.Builder. So how do I achieve the same in uuid im using satori/go.uuid，因为这样做

var buffer bytes.Buffer
var s string
for i := 0; i < 2; i++ {
  s = buffer.WriteString(uuid.Must(uuid.NewV4()))
}

产生此错误 Cannot use 'uuid.Must(uuid.NewV4())' as type string。

我的目标是让 's' 变成这样 15094a36-8827-453a-b27a-598421dbd73b-803bc133-dbc5-4629-9a2e-ef8ed3f1372e

Answer 1

uuid.Must(uuid.NewV4())的类型是uuid.UUID，不是string。调用UUID.Sring()方法得到一个string。完成连接后，调用 buffer.String() 获取 string：

var buffer strings.Builder
for i := 0; i < 2; i++ {
    if i > 0 {
        buffer.WriteByte('-')
    }
    buffer.WriteString(uuid.Must(uuid.NewV4()).String())
}
s := buffer.String()

另一种方法是连接字符串：

var uuids []string
for i := 0; i < 2; i++ {
    uuids = append(uuids, uuid.Must(uuid.NewV4()).String())
}
s := strings.Join(uuids, "-")

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