get positional string from number, ie: first, second, third, thirteenth, twentieth, twenty-first etc

gistfile1.txt

const prefix = {
	1: 'First',
	2: 'Second',
	3: 'Third',
	4: 'Fourth',
	5: 'Fifth',
	6: 'Sixth',
	7: 'Seventh',
	8: 'Eighth',
	9: 'Ninth',
	10: 'Tenth',
	11: 'Eleventh',
	12: 'Twelth',
	13: 'Thirteenth',
	14: 'Fourteenth',
	15: 'Fifteenth',
	16: 'Sixteenth',
	17: 'Seventeenth',
	18: 'Eighteenth',
	19: 'Nineteenth',
	20: {
		lone: 'Twentieth',
		prefix: 'Twenty'
	},
	30: {
		lone: 'Thirtieth',
		prefix: 'Thirty'
	},
	40: {
		lone: 'Fourtieth',
		prefix: 'Fourty'
	},
}

const wordify = (n: number) => {
	if (prefix[n] !== undefined) {
		if (typeof prefix[n] === 'string') return prefix[n]
		return prefix[n].lone
	}

	const step = (n: number, pref: number) => {
		if (n > 10) {
			return step(n - 10, pref + 10)
		}
		return prefix[pref].prefix + '-' + (prefix[n].toLowerCase())
	}

	if (n >= 21) {
		return step(n - 20, 20)
	}
}