Golang: Dynamic Array sample

sample code of dynamic array in Golang.

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package main

import "fmt"

type Arr struct {

arr []string

}

type SError struct {

code    int32

message string

}

func main() {

newArr := &Arr{arr: []string{"a", "b", "c", "d", "e", "f", "g"}}

fmt.Println(newArr.size())

str, err := newArr.get(8)

if err != nil {

fmt.Println(err)

} else {

fmt.Printf("item value = %s", str)

}

newArr.set(10, "asssss")

err = newArr.removeAt(10)

if err != nil {

fmt.Println(err)

} else {

fmt.Printf("removed with index :  %v", newArr.arr)

}

err = newArr.remove("fasd")

if err != nil {

fmt.Println(err)

} else {

fmt.Printf("remove with string: %v", newArr.arr)

}

}

func (arr *Arr) get(i int) (string, *SError) {

if i > arr.size()-1 || i < 0 {

return "", &SError{code: 5, message: fmt.Sprintf("Error accesing index %d from array.", i)}

}

return arr.arr[i], nil

}

func (arr *Arr) set(i int, v string) *SError {

if i > arr.size()-1 || i < 0 {

return &SError{code: 4, message: fmt.Sprintf("%d not exists in the array.", i)}

}

arr.arr[i] = v

return nil

}

func (arr *Arr) add(v string) {

arr.arr = append(arr.arr, v)

}

func (arr *Arr) removeAt(i int) *SError {

if i > arr.size()-1 || i < 0 {

return &SError{code: 3, message: fmt.Sprintf("Error removing index %d from array.", i)}

}

arr.arr = append(arr.arr[:i], arr.arr[i+1:arr.size()]...)

return nil

}

func (arr *Arr) remove(v string) *SError {

if arr.size() == 0 {

return &SError{code: 1, message: "Array is empty"}

}

// find the index

for k, val := range arr.arr {

if val == v {

// and removeAt

arr.removeAt(k)

return nil

}

}

return &SError{code: 2, message: fmt.Sprintf("Error removing %s from array.", v)}

}

func (arr *Arr) size() int {

return len(arr.arr)

}