Golang中好用的三方工具包lancet使用

江湖乄夜雨 / 2023-05-29 / 原文

项目地址

lancet源码项目地址

自己练习的项目:a_lancet_tests

slice 有结构体切片的转换

package a_lancet_tests

import (
    "fmt"
    "github.com/duke-git/lancet/v2/slice"
    "testing"
)

// slice.Map: Notice 结构体切片之间的转换
type teacher struct {
    Name string
    Age  int
}
type teacherRPC struct {
    Name string
    Age  int
}

func TestSliceChange(t *testing.T) {

    tr1 := teacherRPC{Name: "whw", Age: 22}
    tr2 := teacherRPC{Name: "naruto", Age: 23}
    trSlice := []*teacherRPC{&tr1, &tr2}

    // Notice 转化成 *teacher 组成的切片！
    tSlice := slice.Map(trSlice, func(index int, item *teacherRPC) *teacher {
        return &teacher{
            Name: item.Name,
            Age:  item.Age,
        }
    })

    fmt.Printf(">> %T, %v \n", tSlice, tSlice) // []*a_lancet_tests.teacher, [0x1400000c108 0x1400000c120]
}

// slice.Map: 返回结构体切片中某个属性组成的切片
func TestTT123(t *testing.T) {
    type student struct {
        sid  int
        name string
    }

    lst := make([]*student, 0)
    for i := 0; i < 5; i++ {
        currStu := student{
            sid:  i,
            name: fmt.Sprintf("whw-%v", i),
        }
        lst = append(lst, &currStu)
    }

    ret := slice.Map(lst, func(index int, item *student) string {
        return item.name
    })

    fmt.Println("ret: ", ret) // [whw-0 whw-1 whw-2 whw-3 whw-4]

}

～～～

maputil

package a_lancet_tests

import (
    "fmt"
    "github.com/duke-git/lancet/v2/maputil"
    "testing"
)

func TestS1(t *testing.T) {

    m1 := map[string]int{
        "a1": 1,
        "a2": 22,
        "a3": 34,
        "a4": 66,
    }

    // ForEach
    maputil.ForEach(m1, func(key string, val int) {
        fmt.Println("key: ", key, "val: ", val)
    })
    /*
        key:  a1 val:  1
        key:  a2 val:  22
        key:  a3 val:  34
        key:  a4 val:  66
    */

    // Filter
    filterFunc := func(_ string, val int) bool {
        return val > 30
    }

    ret := maputil.Filter(m1, filterFunc)
    fmt.Println("ret: ", ret) // ret:  map[a3:34 a4:66]
}