Question

How to sort a string with digits and letters (digits before letters) in Go

Answer 1

package main
 
import (
    "fmt"
    "sort"
    "strings"
    "unicode"
)
 
func customSort(input string) string {
    chars := strings.Split(input, "")
 
    sort.Slice(chars, func(i, j int) bool {
        a, b := chars[i], chars[j]
 
        if unicode.IsDigit([]rune(a)[0]) && unicode.IsLetter([]rune(b)[0]) {
            return true // Digits before letters
        }
        if unicode.IsLetter([]rune(a)[0]) && unicode.IsDigit([]rune(b)[0]) {
            return false // Letters after digits
        }

        return a < b
    })
 
    return strings.Join(chars, "")
}
 
func main() {
    input := "d25ea4b3c1"
    sortedInput := customSort(input)
 
    fmt.Println("Custom sorted string:", sortedInput)
}
 
 
 
/*
run:
 
Custom sorted string: 12345abcde
 
*/

 

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