golang sort slice descending
To sort a slice in descending order using Go (golang), you can follow these steps:
Import the "sort" package: To use the sorting functions in Go, you need to import the "sort" package. You can do this by adding the following line at the top of your Go file:
go import "sort"
Define the slice: Create a slice of the desired type and populate it with the elements you want to sort. For example, if you have a slice of integers, you can define it like this:
go numbers := []int{5, 2, 8, 1, 9}
Implement the sorting interface: Go provides a sorting interface called "sort.Interface" that needs to be implemented for sorting slices. In order to sort a slice in descending order, you need to create a custom type that satisfies this interface.
Implement the Len() function: In your custom type, you need to implement the Len() function, which returns the length of the slice. For example:
go func (s MySlice) Len() int { return len(s) }
Implement the Less() function: The Less() function compares two elements of the slice and determines whether the element at index i should be considered less than the element at index j. To sort the slice in descending order, you need to reverse the comparison logic. For example:
go func (s MySlice) Less(i, j int) bool { return s[i] > s[j] }
Implement the Swap() function: The Swap() function swaps the elements at indices i and j in the slice. For example:
go func (s MySlice) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
Sort the slice: Finally, you can sort the slice in descending order by calling the "sort.Sort()" function and passing in your custom type. For example:
go sort.Sort(MySlice(numbers))
By following these steps, you should be able to sort a slice in descending order using Go (golang) and the "sort" package.