ゼロパディング

zeroPadding.js

/**
 * ZeroPadding.
 *
 * @param {String|Number} number
 * @return {String}
 * 
 * @example
 * "009" = zeroPadding(9, 3);
 */
function zeroPadding(number, size) {
	var zero = "";
	while (zero.length < size) zero += "0";
	return (zero + number).slice(size * -1);
}

/**
 * ZeroPadding(fixed length).
 *
 * @param {String|Number} number	0~999
 * @return {String}
 * 
 * @example
 * "009" = threeZeroPadding(9);
 */
function threeZeroPadding(number) {
	var result = "";
	
	if (number < 100 && number > 9) result = "0"+ number;
	else if (number < 10) result = "00"+  number;
	else result = number;
	
	return result;
}