Question

How to sort a string with digits and letters (letters before digits) 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.IsLetter([]rune(a)[0]) && unicode.IsDigit([]rune(b)[0]) {
            return true // Letters before digits
        }
        if unicode.IsDigit([]rune(a)[0]) && unicode.IsLetter([]rune(b)[0]) {
            return false // Digits after letters
        }

        return a < b
    })

    return strings.Join(chars, "")
}

func main() {
    input := "d2a4b3c1"
    sortedInput := customSort(input)

    fmt.Println("Custom sorted string:", sortedInput)
}



/*
run:

Custom sorted string: abcd1234

*/

 

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