s0rg/fantasyname

package wrappers

import (
    "fmt"
)

type reverser struct {
    s fmt.Stringer
}

// Reversed creates wrapper, that reverses (foo -> oof) its input.
func Reversed(s fmt.Stringer) fmt.Stringer {
    return &reverser{s: s}
}

func (rv *reverser) String() string {
    return reverse(rv.s.String())
}

func reverse(s string) (rv string) {
    rns := []rune(s)
    for i, j := 0, len(rns)-1; i < j; i, j = i+1, j-1 {
        rns[i], rns[j] = rns[j], rns[i]
    }

    return string(rns)
}