{"data":{"markdownRemark":{"id":"a179fdd9-84ab-5f5d-9673-c344c54057e0","html":"","fields":{"slug":"/blog/how-to-use-javascript-classes-three-different-ways/"},"frontmatter":{"title":"How to use JavaScript Classes? Three Different Ways","cover":"/img/dev-team-at-work2.jpg","tags":["JavaScript","JS Classes"],"lead":"Programmers love JavaScript. They love it for its extremely flexible approach ****and the countless possibilities for creating the same mechanics in completely different ways. A perfect example of **JavaScript flexibility** is the way classes are defined in this language.","content":[{"body":"As you probably know, the definition of JavaScript class isn’t as obvious as in other popular languages like **Java, C#** or **PHP**. In this language, a class is unusual because this mechanism is working on prototypes.\n\nLet’s focus on three types of classes to understand how you can use them in JavaScript. They are: \n\n* prototype-based classes,\n* singleton objects and object literals,\n* ES6 classes.\n\n_Note: This article assumes that you have already basic knowledge about JavaScript  and will follow some examples without detailed explanations._ \n\n## Prototype-based classes\n\nWhat is interesting in this case is that the class syntax is versatile. Let start with a simple **prototype-based** example. The example below presents a method defined internally. This solution can prevent pollution of the global namespace because all methods are defined within the constructor function.\n\n```\nfunction Person(name) {\n    this.name = name;\n    this.welcome = function() {\n        console.log(“Welcome “ + this.name);\n    };\n}\n```\n\nThe second example shows the method added to the prototype. In this case, the “welcome” method is not recreated every time when the new object is initializing. It’s not a popular solution but in some cases can be what we want to achieve. \n\n```\nfunction Person(name) {\n  this.name = name;\n}\n\nPerson.prototype.welcome = function () {\n  console.log(\"Welcome \" + this.name);\n}\n```\n\nIt’s time to present how to demonstrate an object using the Person constructor function, setting some properties and call methods.\n\n```\nconst person = new Person(\"Bob\");\nperson.welcome();    // Welcome Bob\n```\n\n<RelatedArticle title={`Introducing Data Visualization in D3 JavaScript library`} />\n\n## Singleton objects and object literals\n\nLet’s focus now on a method which allows you to use a function to define a **singleton object in the JavaScript language**. This seems really similar to the previous example but is more compact. In the below example, you can see that defining a function and invoking creation of the object is running at the same time.\n\n```\nconst person = new function () {\n  this.name = \"Bob\";\n  this.welcome = function () {\n    console.log(\"Welcome \" + this.name);\n  }\n};\n\nperson.welcome();    // Welcome Bob\n```\n\nIt’s little confusing because it has been used as an anonymous constructor function and we can’t add **dynamic arguments**. As a result, we have only one single instance of this class. \n\nThe other alternative includes the object literals syntax which allows immediate definition of singleton objects. \n\n```\nconst person = {\n  name: \"Bob\",\n  welcome: function () {\n    console.log(\"Welcome \" + this.name);\n  }\n};\n\nperson.welcome();    // Welcome Bob\n```\n\nIn this case, the instance already exists and is ready to use. It’s easy, right?\n\n## ES6 Classes\n\nLet us take a look at what has been introduced in ES6. One of the new things is “syntactic sugar” for classes which is like the overlay on this mechanism. \n\nThereby, “syntactic sugar” means that the new features of the language are not really new because the mechanism is the same with improvements in syntax only.\n\nTherefore, the class constructs allow defining prototype-based classes with clean syntax for programmers. Let's work through an example to understand what they look like.\n\n```\nclass Person {\n  constructor(name) {\n    this.name = name;\n  }\n\n  welcome() {\n    console.log(\"Welcome \" + this.name);\n  }\n}\n\nconst person = new Person(\"Bob\");\nperson.welcome();    // Welcome Bob\n```\n\nIt is essential in all these types of class definition to remember that:\n\n* the class constructor can’t be called without a “new” operator,\n* there cannot exist more than one constructor in the class\n* during object creation, the first step is running the “constructor” method with a particular initial set of properties and values,\n* if “constructor” does not exist in the class then what is generated is an empty function. Then you can execute other implemented methods on created objects,\n* the code inside the class is automatically in strict mode.\n\nThe new class syntax also supports **inheritance and static methods** in a simple way. The inherited object contains all the properties and functions of its parent object. In addition, it allows the specification of its own set of unique properties and functions or the overwriting of existing properties and functions. \n\nIn consequence, inheritance helps us write cleaner code and re-purpose the parent object to save memory on repeating the object property and method definitions. \n\n```\nclass Mechanic extends Person {\n  constructor(name) {\n    super(name);\n  }\n\n  fix() {\n    console.log(this.name + \" fixed your car\");\n  }\n\n  static clean() {\n    console.log(\"Static method\");\n  }\n}\n\nMechanic.clean();      // Static method\nconst mechanic = new Mechanic(\"John\");\nmechanic.welcome();    // Welcome John \nmechanic.fix();        // John fixed your car \n```\n\nLet's explain what’s new about the above code. We used the word static in the “clean” method which defines static methods. This type of method is mainly used to implement methods that belong to the class but are invoked without class initialization. That means that it can’t be invoked by the instance of the class. Furthermore, static methods can also be inherited and can be invoked from subclasses. \n\nYou’ll also notice a new word \"super\" in the **constructor**. The super keyword is used to access and call functions from an object's parent. Additionally, you need to remember that the constructor can be used before the “this” keyword is used. \n\n## Summary\n\nLet’s wrap this article up. By and large, we can’t say with a clear conscience that classes exist in JavaScript because the whole mechanism is based on prototypes. Notwithstanding that, the flexibility of this language provides the developer with many different ways to achieve the desired results.\n\nNew versions of **ECMAScript** standards were introduced with more developer-friendly features. In consequence, this allows writing code in a more readable way. But on the other hand, it does not mean that we shouldn't think about why and how some covers work in this way because that can be turn out to be important in some cases of usage.\n\n<NewsletterSmall id={`article-bottom`} />","fullwidthImage":{"image":"","alt":"","comment":null}}],"settings":{"date":"2019-03-21T08:56:40.848Z","category":"Tech","metaDescription":"The definition of JavaScript class isn’t as obvious as in other popular programming languages. The article focuses on how to use JS classes in different ways.","metaTitle":"How to use JavaScript Classes? Three Different Ways","related":[{"title":"How to start a neural network with JavaScript in 5 minutes"},{"title":"Marble.js – new open source framework for JavaScript"},{"title":"Java vs. JavaScript: what's the difference? 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