>[info] lo * **安裝：** ~~~ go get "github.com/samber/lo@v1.38.1" ~~~ * **lo.Map：（取結果集ids，類似php的 array_column()）** ~~~ package main import ( "fmt" "github.com/samber/lo" ) type ( UserCoupon struct { Id uint64 `db:"id"` // id Name string `db:"name"` // 優惠券名稱 } ) func main() { // 聲明切片 //var userCoupon []UserCoupon userCoupon := make([]UserCoupon, 0) // 添加數據到切片 userCoupon = append(userCoupon, UserCoupon{ Id: 1, Name: "First Coup111on", }, UserCoupon{ Id: 2, Name: "First Coup111on123213", }) //data, _ := json.Marshal(userCoupon) //fmt.Printf("%s\n", string(data)) // 獲取ids UserCouponIds := lo.Map(userCoupon, func(item UserCoupon, index int) uint64 { return item.Id }) // lo.Map()-長度：2,數據：[1 2] fmt.Printf("lo.Map()-長度：%d,數據：%+v", len(UserCouponIds), UserCouponIds) } ~~~ * **lo.SliceToMap()：Slice轉Map** ~~~ package main import ( "fmt" "github.com/samber/lo" ) type ( UserCoupon struct { Id uint64 `db:"id"` // id Name string `db:"name"` // 優惠券名稱 } ) func main() { // 聲明切片 //var userCoupon []UserCoupon userCoupon := make([]UserCoupon, 0) // 添加數據到切片 userCoupon = append(userCoupon, UserCoupon{ Id: 1, Name: "First Coup111on", }, UserCoupon{ Id: 2, Name: "First Coup111on123213", }) //data, _ := json.Marshal(userCoupon) //fmt.Printf("%s\n", string(data)) expiredCouponMap := lo.SliceToMap(userCoupon, func(item UserCoupon) (uint64, bool) { return item.Id, true }) // lo.SliceToMap()-長度：2,數據：map[1:true 2:true] fmt.Printf("lo.SliceToMap()-長度：%d,數據：%+v\n", len(expiredCouponMap), expiredCouponMap) } ~~~