raindrops.go

package raindrops

import "fmt"

func Convert(num int) string {
	return ConvertCompare(num, "A")
}

func ConvertCompare(num int, compare string) string {

	// We build a map of the language
	// We have to preserve order so slices are required
	words := []string{"Pling", "Plang", "Plong"}
	factors := []int{3, 5, 7}

	if compare == "A" {
		return ConvertFactorMapA(num, words, factors)
	} else {
		return ConvertFactorMapB(num, words, factors)
	}
}

func ConvertFactorMapA(num int, words []string, factors []int) string {

	var speak string

	// Determine if given num is composed of any of the factors
	for i, factor := range factors {
		if num%factor == 0 {
			speak += fmt.Sprintf(words[i])
		}
	}

	// If string was not modified by map, emit num
	if len(speak) == 0 {
		speak += fmt.Sprintf("%d", num)
	}

	return speak
}

func ConvertFactorMapB(num int, words []string, factors []int) string {

	var speak string

	// Determine if given num is composed of any of the factors
	for i, factor := range factors {
		if num%factor == 0 {
			speak += fmt.Sprintf(words[i])
		}
	}

	// If string was not modified by map, emit num
	if speak == "" {
		speak += fmt.Sprintf("%d", num)
	}

	return speak
}