helper.js

// helper\.js
const puppeteer = require('puppeteer');





// append the item's category to the base url and add it as a property
// used in map()
let addUrlToItem = function(item) {

	const baseURL = "https://shop-usa.palaceskateboards.com/collections";

	item.url = `${baseURL}/${item.category}`;

	return item;
};


// checks if category passed in matches a valid category
let isValidCategory = function(userCategory) {

	if(typeof userCategory !== "string") // the category must be a string to be valid
		return false;

	const validCategories = ["jackets", "shirting", "trousers", "tracksuits",
							"sweatshirts", "tops", "t-shirts", "hats",
							"footwear", "accessories", "hardware"];

	// check if category the user entered is inside the valid list
	return validCategories.includes(userCategory);
};


let validateItems = function(rawItems) {

	rawItems.forEach(rawItem => {

		// validate the category name (it's a string and matches a valid category)
		if(!isValidCategory(rawItem.category)) {

			console.log("this item's category is malformed:\n");
			console.log(rawItem);
		}
	});
};

/*
 *	Checks for file name in command line arguments
 *	If no file specified, it defaults to 'items.js'
 * 	There is no validation of 'items.js' file,
 *		or if user file was valid
 */
function get_items() {

	const numAcceptableCLParams = 3;
	const filenameIndex = 2;

	let itemsFileName = 'items.js'; // use if nothing was passed through the CL

	// command line contained a file name
	if (process.argv.length === numAcceptableCLParams)
		itemsFileName = process.argv[filenameIndex];

	// import items from file that's relative to the current directory
	let rawItems = require(`./${itemsFileName}`);
	validateItems(rawItems);

	let itemsWithUrls = rawItems.map(addUrlToItem); // add the category's url to each item

	return itemsWithUrls;
};

module.exports = {
	get_items: get_items
};