An overview of the

Slice is a dynamic array, more flexible than array operation, the length is not fixed, can be appended and deleted.

Len () and cap() can return the same and different results.

Statement section


     
    
      
    //demo_7.go
    
      
    package main
    
      
    import (
    
      
        "fmt"
    
      
    )
    
      
    func main() {
    
      
    Var sli_1 [] int //nil
    
      
        fmt.Printf("len=%d cap=%d slice=%v\n",len(sli_1),cap(sli_1),sli_1)
    
      
    Var sli_2 = [] int {
    
      
        fmt.Printf("len=%d cap=%d slice=%v\n",len(sli_1),cap(sli_2),sli_2)
    
      
        var sli_3 = [] int {1, 2, 3, 4, 5}
    
      
        fmt.Printf("len=%d cap=%d slice=%v\n",len(sli_3),cap(sli_3),sli_3)
    
      
        sli_4 := [] int {1, 2, 3, 4, 5}
    
      
        fmt.Printf("len=%d cap=%d slice=%v\n",len(sli_4),cap(sli_4),sli_4)
    
      
        var sli_5 [] int = make([] int, 5, 8)
    
      
        fmt.Printf("len=%d cap=%d slice=%v\n",len(sli_5),cap(sli_5),sli_5)
    
      
        sli_6 := make([] int, 5, 9)
    
      
        fmt.Printf("len=%d cap=%d slice=%v\n",len(sli_6),cap(sli_6),sli_6)
    
      
    }
    
     
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Running results:

Intercept slice


     
    
      
    //demo_8.go
    
      
    package main
    
      
    import (
    
      
        "fmt"
    
      
    )
    
      
    func main() {
    
      
        sli := [] int {1, 2, 3, 4, 5, 6}
    
      
        fmt.Printf("len=%d cap=%d slice=%v\n",len(sli),cap(sli),sli)
    
      
        fmt.Println("sli[1] ==", sli[1])
    
      
        fmt.Println("sli[:] ==", sli[:])
    
      
        fmt.Println("sli[1:] ==", sli[1:])
    
      
        fmt.Println("sli[:4] ==", sli[:4])
    
      
        fmt.Println("sli[0:3] ==", sli[0:3])
    
      
        fmt.Printf("len=%d cap=%d slice=%v\n",len(sli[0:3]),cap(sli[0:3]),sli[0:3])
    
      
        fmt.Println("sli[0:3:4] ==", sli[0:3:4])
    
      
        fmt.Printf("len=%d cap=%d slice=%v\n",len(sli[0:3:4]),cap(sli[0:3:4]),sli[0:3:4])
    
      
    }
    
     
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Running results:

Additional section


     
    
      
    //demo_9.go
    
      
    package main
    
      
    import (
    
      
        "fmt"
    
      
    )
    
      
    func main() {
    
      
        sli := [] int {4, 5, 6}
    
      
        fmt.Printf("len=%d cap=%d slice=%v\n",len(sli),cap(sli),sli)
    
      
        sli = append(sli, 7)
    
      
        fmt.Printf("len=%d cap=%d slice=%v\n",len(sli),cap(sli),sli)
    
      
        sli = append(sli, 8)
    
      
        fmt.Printf("len=%d cap=%d slice=%v\n",len(sli),cap(sli),sli)
    
      
        sli = append(sli, 9)
    
      
        fmt.Printf("len=%d cap=%d slice=%v\n",len(sli),cap(sli),sli)
    
      
        sli = append(sli, 10)
    
      
        fmt.Printf("len=%d cap=%d slice=%v\n",len(sli),cap(sli),sli)
    
      
    }
    
     
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Running results:

In append, when the capacity is insufficient and needs to be expanded, the CAP is doubled.

Delete slices


     
    
      
    //demo_10.go
    
      
    package main
    
      
    import (
    
      
        "fmt"
    
      
    )
    
      
    func main() {
    
      
        sli := [] int {1, 2, 3, 4, 5, 6, 7, 8}
    
      
        fmt.Printf("len=%d cap=%d slice=%v\n",len(sli),cap(sli),sli)
    
      
    // Delete the last two elements
    
      
        fmt.Printf("len=%d cap=%d slice=%v\n",len(sli[:len(sli)-2]),cap(sli[:len(sli)-2]),sli[:len(sli)-2])
    
      
    // Delete the first two elements
    
      
        fmt.Printf("len=%d cap=%d slice=%v\n",len(sli[2:]),cap(sli[2:]),sli[2:])
    
      
    // Delete the middle two elements
    
      
        sli = append(sli[:3], sli[3+2:]...)
    
      
        fmt.Printf("len=%d cap=%d slice=%v\n",len(sli),cap(sli),sli)
    
      
    }
    
     
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Running results:

Recommended reading

  • Go – array

  • Go – Variable declaration

  • Go – Environment installation

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