go-filesort

import filesort "github.com/c9s/go-filesort"

var allFiles []string
filepath.Walk("foo", func(path string, info os.FileInfo, err error) error {
    if err == nil {
        allFiles = append(allFiles, path)
    }
    return err
})

fmt.Printf("Original: %+v\n", allFiles)

sort.Sort(filesort.DefaultSort{allFiles}) // by names
fmt.Printf("Default Sort: %+v\n", allFiles)

sort.Sort(filesort.MtimeSort{allFiles})

fmt.Printf("MtimeSort: %+v\n", allFiles)

sort.Sort(filesort.MtimeReverseSort{allFiles})

fmt.Printf("MtimeReverseSort: %+v\n", allFiles)

sort.Sort(filesort.SizeReverseSort{allFiles})

fmt.Printf("MtimeSizeSort: %+v\n", allFiles)

Or you can do:

var files Files = Files{ "file1", "file2", "file3" }
files.Sort()