Stringify Object.js

/**
 * Converts a key and value to a string.
 *
 * @param {strin} key
 * @param {string|number|boolean|object|function} value
 * @param {string} indent
 * @return {string}
 */
function keyToString(key, value, indent) {
	switch (typeof value) {
		case "object":
			if (Array.isArray(value)) {
				return stringifyArray(value, indent+'\t');
			} else {
				return  stringifyObject(value, indent+'\t');
			}
			break;
		case "function":
			return value.toString();
			break;
		case "string":
			return  "\"" + value + "\"";
			break;
		case "number":
			return value;
			break;
		case "boolean":
			return value;
			break;
		default:
			return value;
	}
}

/**
 * Converts an array to a string.
 *
 * @param {array} arr
 * @param {string} indent
 * @return {string}
 */
function stringifyArray(arr, indent) {
	let str = "[";
	for (let i = 0; i < arr.length; i++) {
		str += keyToString(i, arr[i], indent);
		str += ",";
	}
	str += "]";
	return str;
}

/**
 * Converts an object to a string.
 *
 * @param {object} obj
 * @param {string} indent
 * @return {string}
 */
function stringifyObject(obj, indent) {
	let str = "{";
	if (Object.keys(obj).length){
		for (let key in obj) {
			str += "\n" + indent + "\t" + key + ": " + keyToString(key, obj[key], indent);
			str += ",";
		}
		str += "\n" + indent + "}";
	} else {
		str += "}";
	}
	return str;
}

/**
 * Converts an object or array to a string.
 *
 * @param {object} obj
 * @param {number} indent
 * @return {string}
 */
function stringify(obj, indent) {
	if (Array.isArray(obj)) {
		return stringifyArray(obj, indent);
	} else {
		return stringifyObject(obj, indent);
	}
}