>[info] lo * **安装：** ~~~ go get "github.com/samber/lo@v1.38.1" ~~~ * **lo.Map：（取结果集ids，类似php的 array_column()）** ~~~ package main import ( "fmt" "github.com/samber/lo" ) type ( UserCoupon struct { Id uint64 `db:"id"` // id Name string `db:"name"` // 优惠券名称 } ) func main() { // 声明切片 //var userCoupon []UserCoupon userCoupon := make([]UserCoupon, 0) // 添加数据到切片 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)) // 获取ids UserCouponIds := lo.Map(userCoupon, func(item UserCoupon, index int) uint64 { return item.Id }) // lo.Map()-长度：2,数据：[1 2] fmt.Printf("lo.Map()-长度：%d,数据：%+v", len(UserCouponIds), UserCouponIds) } ~~~ * **lo.SliceToMap()：Slice转Map** ~~~ package main import ( "fmt" "github.com/samber/lo" ) type ( UserCoupon struct { Id uint64 `db:"id"` // id Name string `db:"name"` // 优惠券名称 } ) func main() { // 声明切片 //var userCoupon []UserCoupon userCoupon := make([]UserCoupon, 0) // 添加数据到切片 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()-长度：2,数据：map[1:true 2:true] fmt.Printf("lo.SliceToMap()-长度：%d,数据：%+v\n", len(expiredCouponMap), expiredCouponMap) } ~~~