Function convertNumber2Alphabet

src/project.ts:279–286

* 数値をアルファベットに変換する * 0,1,2,... => a,b,c,...,z,aa,ab,... * @param num

(num: number)

 * @param num
 */
function convertNumber2Alphabet(num: number): string {
	if (num < 0) throw new Error("invalid number");
	let result = "";
	do {
		result = ((num % 26) + 10).toString(36) + result;
	} while ((num = Math.floor(num / 26) - 1) >= 0);
	return result;
}