exercism/go/twelve-days/twelve_days.go

package twelve

const testVersion = 1

func Song() string {
	var ret string
	for i := 1; i <= 12; i++ {
		ret += Verse(i) + "\n"
	}
	return ret
}

func Verse(i int) string {
	ret := "On the " + intToOrd(i) + " day of Christmas my true love gave to me, "
	if i >= 12 {
		ret += "twelve Drummers Drumming, "
	}
	if i >= 11 {
		ret += "eleven Pipers Piping, "
	}
	if i >= 10 {
		ret += "ten Lords-a-Leaping, "
	}
	if i >= 9 {
		ret += "nine Ladies Dancing, "
	}
	if i >= 8 {
		ret += "eight Maids-a-Milking, "
	}
	if i >= 7 {
		ret += "seven Swans-a-Swimming, "
	}
	if i >= 6 {
		ret += "six Geese-a-Laying, "
	}
	if i >= 5 {
		ret += "five Gold Rings, "
	}
	if i >= 4 {
		ret += "four Calling Birds, "
	}
	if i >= 3 {
		ret += "three French Hens, "
	}
	if i >= 2 {
		ret += "two Turtle Doves, and "
	}

	return ret + "a Partridge in a Pear Tree."
}

func intToOrd(i int) string {
	switch i {
	case 1:
		return "first"
	case 2:
		return "second"
	case 3:
		return "third"
	case 4:
		return "fourth"
	case 5:
		return "fifth"
	case 6:
		return "sixth"
	case 7:
		return "seventh"
	case 8:
		return "eighth"
	case 9:
		return "ninth"
	case 10:
		return "tenth"
	case 11:
		return "eleventh"
	case 12:
		return "twelfth"
	}
	return ""
}

/*
	{1, "On the first day of Christmas my true love gave to me, a Partridge in a Pear Tree."},
	{2, "On the second day of Christmas my true love gave to me, two Turtle Doves, and a Partridge in a Pear Tree."},
	{3, "On the third day of Christmas my true love gave to me, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree."},
	{4, "On the fourth day of Christmas my true love gave to me, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree."},
	{5, "On the fifth day of Christmas my true love gave to me, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree."},
	{6, "On the sixth day of Christmas my true love gave to me, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree."},
	{7, "On the seventh day of Christmas my true love gave to me, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree."},
	{8, "On the eighth day of Christmas my true love gave to me, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree."},
	{9, "On the ninth day of Christmas my true love gave to me, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree."},
	{10, "On the tenth day of Christmas my true love gave to me, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree."},
	{11, "On the eleventh day of Christmas my true love gave to me, eleven Pipers Piping, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree."},
	{12, "On the twelfth day of Christmas my true love gave to me, twelve Drummers Drumming, eleven Pipers Piping, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree."},
*/