Golang Program Example to Sort an Array

Go provides a built-in package called sort that you can use to sort arrays and slices. Here's a simple example of how to sort an integer array in ascending order:

package main

import (
    "fmt"
    "sort"
)

func main() {
    // Sample unsorted integer array
    numbers := []int{5, 2, 9, 1, 5, 6}

    // Sorting the array in ascending order
    sort.Ints(numbers)

    // Display the sorted array
    fmt.Println("Sorted array:", numbers)
}

In this example, we use the sort.Ints() function to sort the numbers array in place. The function modifies the original array, so be aware that the order of elements in the numbers array will change after the sort.Ints() call.

If you want to sort an array of a different data type or in descending order, you can use the sort.Sort() function with a custom sort.Interface. Here's an example of sorting a string array in descending order:

package main

import (
    "fmt"
    "sort"
)

type ByLength []string

func (s ByLength) Len() int           { return len(s) }
func (s ByLength) Less(i, j int) bool { return len(s[i]) > len(s[j]) }
func (s ByLength) Swap(i, j int)      { s[i], s[j] = s[j], s[i] }

func main() {
    // Sample unsorted string array
    names := []string{"Alice", "Bob", "Charlie", "Eve", "David"}

    // Sorting the string array in descending order by length
    sort.Sort(ByLength(names))

    // Display the sorted array
    fmt.Println("Sorted array:", names)
}

In this example, we define a custom type ByLength that implements the sort.Interface interface with the required methods (Len(), Less(), and Swap()). We then use sort.Sort(ByLength(names)) to sort the names array in descending order based on the length of the strings.

Remember that the sort package works with slices, not arrays directly. If you have an actual array that you want to sort, you can use a slice to refer to the array elements, as shown in the examples.

See also

• Memory Management in Golang - Safeguarding Efficiency and Stability
• Concurrency and Goroutines - Mastering Parallelism in Golang
• Error Handling in Golang: A Comprehensive Guide with Examples
• Code Formatting and Style - A Guide for Developers
• Introduction to Golang Best Practices

---

Follow me on Twitter