Grizzly allows you to use collections in GO without generics. With Grizzly you can use the methods Map, Filter, Find, etc.
Install Grizzly:
$ go get github.com/matroskin13/grizzlyAnd update your working file:
//go:generate grizzly generate main.go
package main
import (
"fmt"
)
//grizzly:generate
type User struct {
Id int
Name string
Age int
}
func main() {
users := NewUserCollection([]*User{
{Id: 1, Name: "John", Age: 20},
{Id: 2, Name: "Tom", Age: 22},
{Id: 3, Name: "Billy", Age: 20},
{Id: 4, Name: "Mister X", Age: 30},
})
youngUsers := users.Filter(func (user *User) bool {
return user.Age < 30
})
youngUsersIds := youngUsers.MapToInt(func (user *User) int {
return user.Id
})
fmt.Println("young users ids", youngUsersIds)
}And run go generate:
$ go generateCreate file grizzly.json in your root directory
{
"collections": [
{
"name": "user",
"types": {
"id": "int",
"name": "string",
"age": "int"
}
},
{
"name": "city",
"types": {
"cityId": "int"
}
}
]
}And run Grizzly
$ grizzly updateNow you can use the collection code:
package test
import (
"fmt"
"test/collections"
)
func main() {
users := collections.NewUserCollection([]*collections.User{
{Id: 1, Name: "John", Age: 20},
{Id: 2, Name: "Tom", Age: 22},
{Id: 3, Name: "Billy", Age: 20},
{Id: 4, Name: "Mister X", Age: 30},
})
city := collections.NewCitiesCollection([]*collections.Cities{
{CityId: 1},
}).Find(func (city *collections.Cities) bool {
return true
})
youngUsers := users.Filter(func (user *collections.User) bool {
return user.Age < 30
})
Tom := youngUsers.Find(func (user *collections.User) bool {
return user.Name == "Tom"
})
youngUsersIds := youngUsers.MapToInt(func (user *collections.User) int {
return user.Id
})
uniqAges := users.UniqByAge()
sortedAges := users.SortByAge("asc").MapToInt(func (user *collections.User) int {
return user.Age
})
fmt.Println("tom", Tom)
fmt.Println("young users ids", youngUsersIds)
fmt.Println("first city", city)
fmt.Println("uniq ages", uniqAges)
fmt.Println("sorted ages", sortedAges)
}You can also specify the required methods:
{
"name": "User",
"types": {
"id": "int",
"name": "string",
"age": "int"
},
"methods": ["find", "filter"]
}List of default methods: "find", "filter", "maps", "array", "get", "uniq", "sort"
The following methods will be available for the collection:
grizzly.json
{
"collections": [
{
"name": "user",
"types": {
"id": "int",
"name": "string"
}
}
]
}by go generate
//grizzly:generate
type User struct {
Id int
Name string
}func NewUserCollection(items []*User) *UserCollection
func NewEmptyUserCollection() *UserCollection
func (c *UserCollection) Len() int
func (c *UserCollection) ForEach(callback func(item *User))
func (c *UserCollection) Filter(callback SearchCallbackUser) *UserCollection
func (c *UserCollection) Find(callback SearchCallbackUser) *User
func (c *UserCollection) Get(index int) (model *User)
func (c *UserCollection) MapToInt(callback func(item *User) int) []int
func (c *UserCollection) MapToString(callback func(item *User) string) []string
func (c *UserCollection) Pop() *User
func (c *UserCollection) Push(item *User) *UserCollection
func (c *UserCollection) Shift() *User
func (c *UserCollection) SortById(mode string) *UserCollection
func (c *UserCollection) SortByName(mode string) *UserCollection
func (c *UserCollection) UniqById() *UserCollection
func (c *UserCollection) UniqByName() *UserCollection
func (c *UserCollection) Unshift(item *User) *UserCollection
func (c *UserCollection) ForEach(callback func(item *User))
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