https://leanwebclub.com

class-pattern.js

class MyLibrary {

	/**
	 * Create the constructor object
	 * @param {Number} start The starting amount
	 */

	constructor (start = 0) {
		this.total = start;
	}

	/**
	 * Add money to the total
	 */
	add (num = 1) {
		this.total = this.total + num;
	}

	/**
	 * Remove money from the total
	 */
	subtract (num = 1) {
		this.total = this.total - num;
	}
}