Lancet

English

简体中文

English

简体中文

Appearance

Set ​

Set is a data container, like list, but elements of set is not duplicate.

Source ​

Usage ​

go
import (
    set "github.com/duke-git/lancet/v2/datastructure/set"
)

Index ​

Documentation ​

New ​

Create a set instance

Signature:

go
type Set[T comparable] map[T]struct{}
func New[T comparable](items ...T) Set[T]

Example:

go
package main

import (
    "fmt"
    set "github.com/duke-git/lancet/v2/datastructure/set"
)

func main() {
    st := set.New[int](1,2,2,3)
    fmt.Println(st.Values()) //1,2,3
}

FromSlice ​

Create a set from slice

Signature:

go
func FromSlice[T comparable](items []T) Set[T]

Example:

go
package main

import (
    "fmt"
    set "github.com/duke-git/lancet/v2/datastructure/set"
)

func main() {
    st := set.FromSlice([]int{1, 2, 2, 3})
    fmt.Println(st.Values()) //1,2,3
}

Values ​

Return slice of all set data.

⚠️ This function is deprecated. use ToSlice instead.

Signature:

go
func (s Set[T]) Values() []T

Example:

go
package main

import (
    "fmt"
    set "github.com/duke-git/lancet/v2/datastructure/set"
)

func main() {
    st := set.New[int](1,2,2,3)
    fmt.Println(st.Values()) //1,2,3
}

Add ​

Add items to set

Signature:

go
func (s Set[T]) Add(items ...T)

Example:

go
package main

import (
    "fmt"
    set "github.com/duke-git/lancet/v2/datastructure/set"
)

func main() {
    st := set.New[int]()
    st.Add(1, 2, 3)

    fmt.Println(st.Values()) //1,2,3
}

AddIfNotExist ​

AddIfNotExist checks if item exists in the set, it adds the item to set and returns true if it does not exist in the set, or else it does nothing and returns false.

Signature:

go
func (s Set[T]) AddIfNotExist(item T) bool

Example:

go
package main

import (
    "fmt"
    set "github.com/duke-git/lancet/v2/datastructure/set"
)

func main() {
    st := set.New[int]()
    st.Add(1, 2, 3)

    r1 := st.AddIfNotExist(1)
    r2 := st.AddIfNotExist(4)

    fmt.Println(r1) // false
    fmt.Println(r2) // true
    fmt.Println(st.Values()) // 1,2,3,4
}

AddIfNotExistBy ​

AddIfNotExistBy checks if item exists in the set and pass the `checker` function it adds the item to set and returns true if it does not exists in the set and function `checker` returns true, or else it does nothing and returns false.

Signature:

go
func (s Set[T]) AddIfNotExistBy(item T, checker func(element T) bool) bool

Example:

go
package main

import (
    "fmt"
    set "github.com/duke-git/lancet/v2/datastructure/set"
)

func main() {
    st := set.New[int]()
    st.Add(1, 2)

    ok := st.AddIfNotExistBy(3, func(val int) bool {
        return val%2 != 0
    })
    fmt.Println(ok) // true


    notOk := st.AddIfNotExistBy(4, func(val int) bool {
        return val%2 != 0
    })
    fmt.Println(notOk) // false

    fmt.Println(st.Values()) // 1, 2, 3
}

Delete ​

Delete item in set

Signature:

go
func (s Set[T]) Delete(items ...T)

Example:

go
package main

import (
    "fmt"
    set "github.com/duke-git/lancet/v2/datastructure/set"
)

func main() {
    st := set.New[int]()
    st.Add(1, 2, 3)

    set.Delete(3)
    fmt.Println(st.Values()) //1,2
}

Contain ​

Check if item is in set or not

Signature:

go
func (s Set[T]) Contain(item T) bool

Example:

go
package main

import (
    "fmt"
    set "github.com/duke-git/lancet/v2/datastructure/set"
)

func main() {
    st := set.New[int]()
    st.Add(1, 2, 3)

    fmt.Println(st.Contain(1)) //true
    fmt.Println(st.Contain(4)) //false
}

ContainAll ​

Checks if set contains another set

Signature:

go
func (s Set[T]) ContainAll(other Set[T]) bool

Example:

go
package main

import (
    "fmt"
    set "github.com/duke-git/lancet/v2/datastructure/set"
)

func main() {
    set1 := set.New(1, 2, 3)
    set2 := set.New(1, 2)
    set3 := set.New(1, 2, 3, 4)

    fmt.Println(set1.ContainAll(set2)) //true
    fmt.Println(set1.ContainAll(set3)) //false
}

Size ​

Get the number of elements in set

Signature:

go
func (s Set[T]) Size() int

Example:

go
package main

import (
    "fmt"
    set "github.com/duke-git/lancet/v2/datastructure/set"
)

func main() {
    set1 := set.New(1, 2, 3)

    fmt.Println(set1.Size()) //3
}

Clone ​

Make a copy of set

Signature:

go
func (s Set[T]) Clone() Set[T]

Example:

go
package main

import (
    "fmt"
    set "github.com/duke-git/lancet/v2/datastructure/set"
)

func main() {
    set1 := set.New(1, 2, 3)
    set2 := set1.Clone()

    fmt.Println(set1.Size() == set2.Size()) //true
    fmt.Println(set1.ContainAll(set2)) //true
}

Equal ​

Check if two sets has same elements or not

Signature:

go
func (s Set[T]) Equal(other Set[T]) bool

Example:

go
package main

import (
    "fmt"
    set "github.com/duke-git/lancet/v2/datastructure/set"
)

func main() {
    set1 := set.New(1, 2, 3)
    set2 := set.New(1, 2, 3)
    set3 := set.New(1, 2, 3, 4)

    fmt.Println(set1.Equal(set2)) //true
    fmt.Println(set1.Equal(set3)) //false
}

Iterate ​

Call function by every element of set

Signature:

go
func (s Set[T]) Iterate(fn func(item T))

Example:

go
package main

import (
    "fmt"
    set "github.com/duke-git/lancet/v2/datastructure/set"
)

func main() {
    set1 := set.New(1, 2, 3)
    arr := []int{}
    set.Iterate(func(item int) {
        arr = append(arr, item)
    })

    fmt.Println(arr) //1,2,3
}

EachWithBreak ​

Iterates over elements of a set and invokes function for each element, when iteratee return false, will break the for each loop.

Signature:

go
func (s Set[T]) EachWithBreak(iteratee func(item T) bool)

Example:

go
package main

import (
    "fmt"
    set "github.com/duke-git/lancet/v2/datastructure/set"
)

func main() {
    s := set.New(1, 2, 3, 4, 5)

    var sum int

    s.EachWithBreak(func(n int) bool {
        if n > 3 {
            return false
        }
        sum += n
        return true
    })

    fmt.Println(sum) //6
}

IsEmpty ​

Check if the set is empty or not

Signature:

go
func (s Set[T]) IsEmpty() bool

Example:

go
package main

import (
    "fmt"
    set "github.com/duke-git/lancet/v2/datastructure/set"
)

func main() {
    set1 := set.New(1, 2, 3)
    set2 := set.New()

    fmt.Println(set1.IsEmpty()) //false
    fmt.Println(set2.IsEmpty()) //true
}

Union ​

Create a new set contain all element of set s and other

Signature:

go
func (s Set[T]) Union(other Set[T]) Set[T]

Example:

go
package main

import (
    "fmt"
    set "github.com/duke-git/lancet/v2/datastructure/set"
)

func main() {
    set1 := set.New(1, 2, 3)
    set2 := set.New(2, 3, 4, 5)
    set3 := set1.Union(set2)

    fmt.Println(set3.Values()) //1,2,3,4,5
}

Intersection ​

Create a new set whose element both be contained in set s and other

Signature:

go
func (s Set[T]) Intersection(other Set[T]) Set[T]

Example:

go
package main

import (
    "fmt"
    set "github.com/duke-git/lancet/v2/datastructure/set"
)

func main() {
    set1 := set.New(1, 2, 3)
    set2 := set.New(2, 3, 4, 5)
    set3 := set1.Intersection(set2)

    fmt.Println(set3.Values()) //2,3
}

SymmetricDifference ​

Create a new set whose element is in set1 or set2, but not in both set1 and set2

Signature:

go
func (s Set[T]) SymmetricDifference(other Set[T]) Set[T]

Example:

go
package main

import (
    "fmt"
    set "github.com/duke-git/lancet/v2/datastructure/set"
)

func main() {
    set1 := set.New(1, 2, 3)
    set2 := set.New(2, 3, 4, 5)
    set3 := set1.SymmetricDifference(set2)

    fmt.Println(set3.Values()) //1,4,5
}

Minus ​

Create an set of whose element in origin set but not in compared set

Signature:

go
func (s Set[T]) Minus(comparedSet Set[T]) Set[T]

Example:

go
package main

import (
    "fmt"
    set "github.com/duke-git/lancet/v2/datastructure/set"
)

func main() {
    set1 := set.New(1, 2, 3)
    set2 := set.New(2, 3, 4, 5)
    set3 := set.New(2, 3)

    res1 := set1.Minus(set2)
    fmt.Println(res1.Values()) //1

    res2 := set2.Minus(set3)
    fmt.Println(res2.Values()) //4,5
}

Pop ​

Delete the top element of set then return it, if set is empty, return nil-value of T and false.

Signature:

go
func (s Set[T]) Pop() (v T, ok bool)

Example:

go
package main

import (
    "fmt"
    set "github.com/duke-git/lancet/v2/datastructure/set"
)

func main() {
    s := set.New[int]()
    s.Add(1)
    s.Add(2)
    s.Add(3)

    val, ok = s.Pop()

    fmt.Println(val) // 3
    fmt.Println(ok) // true
}

ToSlice ​

returns a slice containing all values of the set.

Signature:

go
func (s Set[T]) ToSlice() (v T, ok bool)

Example:

go
func main() {
    s := set.New(1, 2, 3, 4, 5)

    val := s.ToSlice()
    fmt.Println(val) // [2 3 4 5 1]
}

ToSortedSlice ​

returns a sorted slice containing all values of the set

Signature:

go
func (s Set[T]) ToSortedSlice() (v T, ok bool)

Example:

go
func main() {
    s1 := set.New(1, 2, 3, 4, 5)
    type Person struct {
		Name string
		Age  int
	}
	s2 := FromSlice([]Person{{"Tom", 20}, {"Jerry", 18}, {"Spike", 25}})

    res1 := s1.ToSortedSlice(func(v1, v2 int) bool {
		return v1 < v2
	})
    
    res2 := s2.ToSortedSlice(func(v1, v2 Person) bool {
		return v1.Age < v2.Age
	})
    
    fmt.Println(res1) // [1 2 3 4 5]
    fmt.Println(res2) // [{Jerry 18} {Tom 20} {Spike 25}]
}