Number to words typescript implementations

Here is a modified copy of a code that converts number to words.

	const num = "ZERO ONE TWO THREE FOUR FIVE SIX SEVEN EIGHT NINE TEN ELEVEN TWELVE THIRTEEN FOURTEEN FIFTEEN SIXTEEN SEVENTEEN EIGHTEEN NINETEEN".split(" ");
	const tens = "TWENTY THIRTY FOURTY FIFTY SIXTY SEVENTY EIGHTY NINETY".split(" ");
	const centString = ' CENTS';

	export function number2words(n : number)
	{
	let n1 = Math.floor(n);
	let n2 = fract(n);
	let n3 = numberWord(n1);
	let n4 = numberWord(n2) + centString;
	return n3 + ' AND ' + n4;
	}

	export function numberWord (n) {

	if (n < 20) return num[n];
	var digit = n%10;
	if (n < 100) return tens[~~(n/10)-2] + (digit? "-" + num[digit]: "");
	if (n < 1000) return num[~~(n/100)] +" HUNDRED" + (n%100 == 0? "": " " + numberWord(n%100));
	return numberWord(~~(n/1000)) + " THOUSAND" + (n%1000 != 0? " " + numberWord(n%1000): "");
	}

	function fract(n)
	{
	let fracValue = String(n).split('.')[1];
	if (fracValue)
	{
	if (fracValue.length == 1)
	fracValue = fracValue + '0';
	else if (fracValue.length > 2)
	{
	fracValue = fracValue[0] + '0';
	}
	}
	else
	fracValue = '0';

	return Number(fracValue);
	}

mitzen