const isEqual = require('fast-deep-equal');

function get(obj, path, defValue) {
	if (!path) {
		return undefined;
	}
	const pathArray = Array.isArray(path)
		? path
		: path.match(/([^[.\]])+/g);
	return (
		pathArray.reduce((prevObj, key) => prevObj && prevObj[key], obj) || defValue
	);
}

function difference(arr1, arr2) {
	return arr1.filter(x => !arr2.includes(x));
}

function intersection(arr, ...args) {
	return arr.filter(item => args.every(arr => arr.includes(item)));
}

module.exports = {
	difference,
	get,
	intersection,
	isEqual
};