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slicelement 用于查找一个元素是否在简单和复杂的数组或者切片类型数据中存在 spread retract

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README.md

package slicelement

Go library for finding element in slice type or operating set including union, interaction and difference.

it not only supports the buildin types which includes []int/[]*int, []float/[]*float, []string/[]*string, but also it supports []struct/[]*struct . The latter is very important and convenient

Installation

Standard go get:

    $  go get -v -u github.com/1046102779/slicelement

Index

//  find the element whether exists in data, if exist, return true, nil 
func Contains(data interface{}, elem interface{}, tag string) (bool, error)

// get the element index in data, if not exist, return -1, nil. 
func GetIndex(data interface{}, elem interface{}, tag string) (int, error)

// set difference, formula:  dataC =  dataA - dataB
// Param tag: unique key.  if not , it may be covered.
// eg. type User struct { UserId int, Name string, Tel string, Sex int16}
// var ( usersA, usersB []*User )
func GetDifference(dataA interface{}, dataB interface{}, tag string) (interface{}, error)

// set interaction, formula: dataC = dataA ∩ dataB , it also supports slice struct
// Param tag: unique key.  if not , it may be covered.
// eg. type User struct { UserId int, Name string, Tel string, Sex int16}
// var ( usersA, usersB []*User )
func GetInteraction(dataA interface{}, dataB interface{}, tagName string) (interface{}, error) 

// set union, formula: dataC = dataA U dataB
// Param tag: unique key.  if not , it may be covered.
// eg. type User struct { UserId int, Name string, Tel string, Sex int16}
// var ( usersA, usersB []*User )
func GetUnion(dataA interface{}, dataB interface{}, tagName string) ( interface{}, error)

desc: if the data's type is not []*struct/[]struct, the tag value is empty

Usage & Example

For usage and examples see the Godoc

example 1: []struct GetIndex

data := []*Person{
    &Person{
        Name:     "John",
        Age:      29,
        Children: []string{"David", "Lily", "Bruce Lee"},
    },
    &Person{
        Name:     "Joe",
        Age:      18,
        Children: []string{},
    },
}
elem := 18
index, err := slicelement.GetIndex(data, elem, "Age")
if err != nil {
    fmt.Println(err.Error())
}
fmt.Println("index=", index)
// output: index=1

example 2: []struct GetUnion

type Student struct {
    Name string
    Age  int
}
studentA := []Student{             studentB := []Student{
    Student{                            Student{
        Name: "donghai",                    Name: "Joe",
        Age:  29,                           Age:  18,
    },                                  },
    Student{                            Student{
        Name: "jixaing",                    Name: "David",
        Age:  19,                           Age:  19,
    },                                  },
}                                   }

if studentC, err := slicelement.GetUnion(studentA, studentB, "Age"); err != nil {
    fmt.Println(err.Error())
} else {
    fmt.Println("result: ", studentC)
}
// result:  [{donghai 29} {jixaing 19} {Joe 18}]  
// {"David", 19} is covered by {"jixiang", 19}

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